diff --git a/app/dialog/preferences/tabs/preferencesdisktab.cpp b/app/dialog/preferences/tabs/preferencesdisktab.cpp
index b62e6f965..ea167d0c9 100644
--- a/app/dialog/preferences/tabs/preferencesdisktab.cpp
+++ b/app/dialog/preferences/tabs/preferencesdisktab.cpp
@@ -102,12 +102,8 @@ bool PreferencesDiskTab::Validate()
   if (disk_cache_location_->text() != default_disk_cache_folder_->GetPath()) {
     // Disk cache location is changing
 
-    // Check if the user wants to move the cache here
-    if (QMessageBox::question(this,
-                              tr("Disk Cache"),
-                              tr("You've chosen to change the default disk cache location. This "
-                                 "will invalidate your current cache. Would you like to continue?"),
-                              QMessageBox::Ok | QMessageBox::Cancel) == QMessageBox::Cancel) {
+    // Check if the user is okay with invalidating the current cache
+    if (!DiskManager::ShowDiskCacheChangeConfirmationDialog(this)) {
       return false;
     }
 
diff --git a/app/dialog/projectproperties/projectproperties.cpp b/app/dialog/projectproperties/projectproperties.cpp
index 8a1b61655..abddcc295 100644
--- a/app/dialog/projectproperties/projectproperties.cpp
+++ b/app/dialog/projectproperties/projectproperties.cpp
@@ -34,6 +34,7 @@ namespace OCIO = OCIO_NAMESPACE::v1;
 #include "config/config.h"
 #include "core.h"
 #include "render/colormanager.h"
+#include "render/diskmanager.h"
 
 OLIVE_NAMESPACE_ENTER
 
@@ -89,8 +90,6 @@ ProjectPropertiesDialog::ProjectPropertiesDialog(Project* p, QWidget *parent) :
     color_outer_layout->addStretch();
   }
 
-  
-
   {
     // Cache group
     QWidget* cache_group = new QWidget();
@@ -148,9 +147,10 @@ void ProjectPropertiesDialog::accept()
     return;
   }
 
+  QString new_cache_path;
+
   if (disk_cache_use_default_btn_->isChecked()) {
-    // Empty cache path means default
-    working_project_->set_cache_path(QString());
+    // Keep new cache path empty, which means default
   } else if (disk_cache_store_alongside_project_btn_->isChecked()) {
     QMessageBox::information(this, QString(), tr("\"Store alignside project\" functionality not implemented yet"));
     return;
@@ -166,7 +166,19 @@ void ProjectPropertiesDialog::accept()
       return;
     }
 
-    working_project_->set_cache_path(cache_path_->text());
+    // Set new path to the text as entered
+    new_cache_path = cache_path_->text();
+  }
+
+  if (new_cache_path != working_project_->cache_path(false)) {
+    // Check if the user is okay with invalidating the current cache
+    if (!DiskManager::ShowDiskCacheChangeConfirmationDialog(this)) {
+      return;
+    }
+
+    working_project_->set_cache_path(new_cache_path);
+
+    emit DiskManager::instance()->InvalidateProject(working_project_);
   }
 
   // This should ripple changes throughout the program that the color config has changed, therefore must be done last
@@ -210,7 +222,6 @@ void ProjectPropertiesDialog::OCIOFilenameUpdated()
         default_input_colorspace_->setCurrentIndex(default_input_colorspace_->count()-1);
       }
     }
-
   } catch (OCIO::Exception& e) {
     ocio_config_is_valid_ = false;
     ocio_filename_->setStyleSheet(QStringLiteral("QLineEdit {color: red;}"));
diff --git a/app/project/project.cpp b/app/project/project.cpp
index 5b14774d9..fe1e307aa 100644
--- a/app/project/project.cpp
+++ b/app/project/project.cpp
@@ -26,6 +26,7 @@
 #include "common/xmlutils.h"
 #include "core.h"
 #include "dialog/progress/progress.h"
+#include "render/diskmanager.h"
 #include "window/mainwindow/mainwindow.h"
 
 OLIVE_NAMESPACE_ENTER
@@ -63,6 +64,10 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, const
         }
       }
 
+    } else if (reader->name() == QStringLiteral("cachepath")) {
+
+      set_cache_path(reader->readElementText());
+
     } else if (reader->name() == QStringLiteral("layout")) {
 
       // Since the main window's functions have to occur in the GUI thread (and we're likely
@@ -98,6 +103,8 @@ void Project::Save(QXmlStreamWriter *writer) const
 
   writer->writeTextElement("url", filename_);
 
+  writer->writeTextElement("cachepath", cache_path(false));
+
   root_.Save(writer);
 
   writer->writeStartElement("colormanagement");
@@ -195,4 +202,12 @@ bool Project::is_new() const
   return !is_modified_ && filename_.isEmpty();
 }
 
+const QString &Project::cache_path(bool default_if_empty) const
+{
+  if (cache_path_.isEmpty() && default_if_empty) {
+    return DiskManager::instance()->GetDefaultCachePath();
+  }
+  return cache_path_;
+}
+
 OLIVE_NAMESPACE_EXIT
diff --git a/app/project/project.h b/app/project/project.h
index 2a806c29c..9fa99ce48 100644
--- a/app/project/project.h
+++ b/app/project/project.h
@@ -25,7 +25,6 @@
 #include <memory>
 
 #include "render/colormanager.h"
-#include "render/diskmanager.h"
 #include "project/item/folder/folder.h"
 #include "window/mainwindow/mainwindowlayoutinfo.h"
 
@@ -72,14 +71,10 @@ public:
 
   bool is_new() const;
 
-  const QString& cache_path(bool default_if_empty = true) const {
-    if (cache_path_.isEmpty() && default_if_empty) {
-      return DiskManager::instance()->GetDefaultCachePath();
-    }
-    return cache_path_;
-  }
+  const QString& cache_path(bool default_if_empty = true) const;
 
-  void set_cache_path(const QString& cache_path) {
+  void set_cache_path(const QString& cache_path)
+  {
     cache_path_ = cache_path;
   }
 
diff --git a/app/render/audioplaybackcache.cpp b/app/render/audioplaybackcache.cpp
index 3a1a78a34..e8ba9dabc 100644
--- a/app/render/audioplaybackcache.cpp
+++ b/app/render/audioplaybackcache.cpp
@@ -37,8 +37,6 @@ AudioPlaybackCache::AudioPlaybackCache(QObject* parent) :
 
 void AudioPlaybackCache::SetParameters(const AudioParams &params)
 {
-  QMutexLocker locker(lock());
-
   if (params_ == params) {
     return;
   }
@@ -52,22 +50,17 @@ void AudioPlaybackCache::SetParameters(const AudioParams &params)
   }
 
   // Our current audio cache is unusable, so we truncate it automatically
-  TimeRange invalidate_range(0, NoLockGetLength());
+  TimeRange invalidate_range(0, GetLength());
   if (invalidate_range.in() != invalidate_range.out()) {
-    NoLockInvalidate(invalidate_range);
+    Invalidate(invalidate_range);
   }
 
-  locker.unlock();
-
   emit ParametersChanged();
-  emit Invalidated(invalidate_range);
 }
 
 void AudioPlaybackCache::WritePCM(const TimeRange &range, SampleBufferPtr samples, const qint64 &job_time)
 {
-  QMutexLocker locker(lock());
-
-  QList<TimeRange> valid_ranges = NoLockGetValidRanges(range, job_time);
+  QList<TimeRange> valid_ranges = GetValidRanges(range, job_time);
   if (valid_ranges.isEmpty()) {
     return;
   }
@@ -102,11 +95,7 @@ void AudioPlaybackCache::WritePCM(const TimeRange &range, SampleBufferPtr sample
 
     f.close();
 
-    NoLockValidate(range);
-
-    locker.unlock();
-
-    emit Validated(range);
+    Validate(range);
   } else {
     qWarning() << "Failed to write PCM data to" << filename_;
   }
@@ -114,8 +103,6 @@ void AudioPlaybackCache::WritePCM(const TimeRange &range, SampleBufferPtr sample
 
 void AudioPlaybackCache::WriteSilence(const TimeRange &range)
 {
-  QMutexLocker locker(lock());
-
   QFile f(filename_);
   if (f.open(QFile::ReadWrite)) {
     qint64 start_offset = params_.time_to_bytes(range.in());
@@ -132,6 +119,8 @@ void AudioPlaybackCache::WriteSilence(const TimeRange &range)
     f.write(a);
 
     f.close();
+
+    Validate(range);
   } else {
     qWarning() << "Failed to write PCM data to" << filename_;
   }
@@ -232,7 +221,7 @@ void AudioPlaybackCache::LengthChangedEvent(const rational& old, const rational&
   }
 }
 
-QList<TimeRange> AudioPlaybackCache::NoLockGetValidRanges(const TimeRange& range, const qint64& job_time)
+QList<TimeRange> AudioPlaybackCache::GetValidRanges(const TimeRange& range, const qint64& job_time)
 {
   QList<TimeRange> valid_ranges;
 
diff --git a/app/render/audioplaybackcache.h b/app/render/audioplaybackcache.h
index 5fdb224df..fe9c7cd6f 100644
--- a/app/render/audioplaybackcache.h
+++ b/app/render/audioplaybackcache.h
@@ -33,8 +33,8 @@ class AudioPlaybackCache : public PlaybackCache
 public:
   AudioPlaybackCache(QObject* parent = nullptr);
 
-  AudioParams GetParameters() {
-    QMutexLocker locker(lock());
+  AudioParams GetParameters()
+  {
     return params_;
   }
 
@@ -48,12 +48,7 @@ public:
 
   const QString& GetCacheFilename() const;
 
-  QList<TimeRange> GetValidRanges(const TimeRange &range, const qint64 &job_time)
-  {
-    QMutexLocker locker(lock());
-
-    return NoLockGetValidRanges(range, job_time);
-  }
+  QList<TimeRange> GetValidRanges(const TimeRange &range, const qint64 &job_time);
 
 signals:
   void ParametersChanged();
@@ -64,8 +59,6 @@ protected:
   virtual void LengthChangedEvent(const rational& old, const rational& newlen) override;
 
 private:
-  QList<TimeRange> NoLockGetValidRanges(const TimeRange &range, const qint64 &job_time);
-
   void UpdateFilename(const QString& s);
 
   QString filename_;
diff --git a/app/render/diskmanager.cpp b/app/render/diskmanager.cpp
index 076bf0475..7194e63b6 100644
--- a/app/render/diskmanager.cpp
+++ b/app/render/diskmanager.cpp
@@ -136,6 +136,15 @@ DiskCacheFolder *DiskManager::GetOpenFolder(const QString &path)
   return f;
 }
 
+bool DiskManager::ShowDiskCacheChangeConfirmationDialog(QWidget *parent)
+{
+  return (QMessageBox::question(parent,
+                                tr("Disk Cache"),
+                                tr("You've chosen to change the default disk cache location. This "
+                                   "will invalidate your current cache. Would you like to continue?"),
+                                QMessageBox::Ok | QMessageBox::Cancel) == QMessageBox::Ok);
+}
+
 DiskCacheFolder::DiskCacheFolder(const QString &path, QObject *parent) :
   QObject(parent)
 {
diff --git a/app/render/diskmanager.h b/app/render/diskmanager.h
index 551534c4f..9fc04cf7a 100644
--- a/app/render/diskmanager.h
+++ b/app/render/diskmanager.h
@@ -26,6 +26,7 @@
 #include <QObject>
 
 #include "common/define.h"
+#include "project/project.h"
 
 OLIVE_NAMESPACE_ENTER
 
@@ -128,6 +129,8 @@ public:
     return open_folders_;
   }
 
+  static bool ShowDiskCacheChangeConfirmationDialog(QWidget* parent);
+
 public slots:
   void Accessed(const QString& cache_folder, const QByteArray& hash);
 
@@ -136,6 +139,8 @@ public slots:
 signals:
   void DeletedFrame(const QString& path, const QByteArray& hash);
 
+  void InvalidateProject(Project* p);
+
 private:
   DiskManager();
 
diff --git a/app/render/framehashcache.cpp b/app/render/framehashcache.cpp
index f4e980446..7ed84d274 100644
--- a/app/render/framehashcache.cpp
+++ b/app/render/framehashcache.cpp
@@ -39,20 +39,17 @@ FrameHashCache::FrameHashCache(QObject *parent) :
 {
   if (DiskManager::instance()) {
     connect(DiskManager::instance(), &DiskManager::DeletedFrame, this, &FrameHashCache::HashDeleted);
+    connect(DiskManager::instance(), &DiskManager::InvalidateProject, this, &FrameHashCache::ProjectInvalidated);
   }
 }
 
 QByteArray FrameHashCache::GetHash(const rational &time)
 {
-  QMutexLocker locker(lock());
-
   return time_hash_map_.value(time);
 }
 
 void FrameHashCache::SetHash(const rational &time, const QByteArray &hash, const qint64& job_time, bool frame_exists)
 {
-  QMutexLocker locker(lock());
-
   bool is_current = false;
 
   for (int i=jobs_.size()-1; i>=0; i--) {
@@ -74,54 +71,34 @@ void FrameHashCache::SetHash(const rational &time, const QByteArray &hash, const
   TimeRange validated_range;
   if (frame_exists) {
     validated_range = TimeRange(time, time + timebase_);
-    NoLockValidate(validated_range);
-  }
-
-  locker.unlock();
-
-  if (frame_exists) {
-    emit Validated(validated_range);
+    Validate(validated_range);
   }
 }
 
 void FrameHashCache::SetTimebase(const rational &tb)
 {
-  QMutexLocker locker(lock());
-
   timebase_ = tb;
 }
 
 void FrameHashCache::ValidateFramesWithHash(const QByteArray &hash)
 {
-  QMutexLocker locker(lock());
-
   QMap<rational, QByteArray>::const_iterator iterator;
 
-  const TimeRangeList& invalidated_ranges = NoLockGetInvalidatedRanges();
-  TimeRangeList ranges_validated;
+  const TimeRangeList& invalidated_ranges = GetInvalidatedRanges();
 
   for (iterator=time_hash_map_.begin();iterator!=time_hash_map_.end();iterator++) {
     if (iterator.value() == hash) {
       TimeRange frame_range(iterator.key(), iterator.key() + timebase_);
 
       if (invalidated_ranges.ContainsTimeRange(frame_range)) {
-        NoLockValidate(frame_range);
-        ranges_validated.InsertTimeRange(frame_range);
+        Validate(frame_range);
       }
     }
   }
-
-  locker.unlock();
-
-  foreach (const TimeRange& range, ranges_validated) {
-    emit Validated(range);
-  }
 }
 
 QList<rational> FrameHashCache::GetFramesWithHash(const QByteArray &hash)
 {
-  QMutexLocker locker(lock());
-
   QList<rational> times;
 
   QMap<rational, QByteArray>::const_iterator iterator;
@@ -137,8 +114,6 @@ QList<rational> FrameHashCache::GetFramesWithHash(const QByteArray &hash)
 
 QList<rational> FrameHashCache::TakeFramesWithHash(const QByteArray &hash)
 {
-  QMutexLocker locker(lock());
-
   QList<rational> times;
 
   QMap<rational, QByteArray>::iterator iterator = time_hash_map_.begin();
@@ -154,13 +129,7 @@ QList<rational> FrameHashCache::TakeFramesWithHash(const QByteArray &hash)
   }
 
   foreach (const rational& r, times) {
-    NoLockInvalidate(TimeRange(r, r + timebase_));
-  }
-
-  locker.unlock();
-
-  foreach (const rational& r, times) {
-    emit Invalidated(TimeRange(r, r + timebase_));
+    Invalidate(TimeRange(r, r + timebase_));
   }
 
   return times;
@@ -168,8 +137,6 @@ QList<rational> FrameHashCache::TakeFramesWithHash(const QByteArray &hash)
 
 QMap<rational, QByteArray> FrameHashCache::time_hash_map()
 {
-  QMutexLocker locker(lock());
-
   return time_hash_map_;
 }
 
@@ -205,23 +172,17 @@ QVector<rational> FrameHashCache::GetFrameListFromTimeRange(TimeRangeList range_
 
 QVector<rational> FrameHashCache::GetFrameListFromTimeRange(const TimeRangeList &range)
 {
-  QMutexLocker locker(lock());
-
   return GetFrameListFromTimeRange(range, timebase_);
 }
 
 QVector<rational> FrameHashCache::GetInvalidatedFrames()
 {
-  QMutexLocker locker(lock());
-
-  return GetFrameListFromTimeRange(NoLockGetInvalidatedRanges(), timebase_);
+  return GetFrameListFromTimeRange(GetInvalidatedRanges());
 }
 
 QVector<rational> FrameHashCache::GetInvalidatedFrames(const TimeRange &intersecting)
 {
-  QMutexLocker locker(lock());
-
-  return GetFrameListFromTimeRange(NoLockGetInvalidatedRanges().Intersects(intersecting), timebase_);
+  return GetFrameListFromTimeRange(GetInvalidatedRanges().Intersects(intersecting));
 }
 
 bool FrameHashCache::SaveCacheFrame(const QByteArray& hash,
@@ -379,24 +340,20 @@ void FrameHashCache::HashDeleted(const QString& s, const QByteArray &hash)
     return;
   }
 
-  QMutexLocker locker(lock());
-
-  TimeRangeList invalidated;
-
   QMap<rational, QByteArray>::const_iterator i;
   for (i=time_hash_map_.constBegin(); i!=time_hash_map_.constEnd(); i++) {
     if (i.value() == hash) {
-      TimeRange r(i.key(), i.key() + timebase_);
-
-      NoLockInvalidate(r);
-      invalidated.InsertTimeRange(r);
+      Invalidate(TimeRange(i.key(), i.key() + timebase_));
     }
   }
+}
 
-  locker.unlock();
+void FrameHashCache::ProjectInvalidated(Project *p)
+{
+  if (GetProject() == p) {
+    time_hash_map_.clear();
 
-  foreach (const TimeRange& r, invalidated) {
-    emit Invalidated(r);
+    InvalidateAll();
   }
 }
 
diff --git a/app/render/framehashcache.h b/app/render/framehashcache.h
index 5c6fe8c58..d3314e587 100644
--- a/app/render/framehashcache.h
+++ b/app/render/framehashcache.h
@@ -89,6 +89,8 @@ private:
 private slots:
   void HashDeleted(const QString &s, const QByteArray& hash);
 
+  void ProjectInvalidated(Project* p);
+
 };
 
 OLIVE_NAMESPACE_EXIT
diff --git a/app/render/playbackcache.cpp b/app/render/playbackcache.cpp
index 3bde6ebe5..d791e4bd9 100644
--- a/app/render/playbackcache.cpp
+++ b/app/render/playbackcache.cpp
@@ -30,36 +30,30 @@ OLIVE_NAMESPACE_ENTER
 
 void PlaybackCache::Invalidate(const TimeRange &r)
 {
-  QMutexLocker locker(lock());
+  Q_ASSERT(r.in() != r.out());
 
-  NoLockInvalidate(r);
+  invalidated_.InsertTimeRange(r);
 
-  locker.unlock();
+  RemoveRangeFromJobs(r);
+  qint64 job_time = QDateTime::currentMSecsSinceEpoch();
+  jobs_.append({r, job_time});
+
+  InvalidateEvent(r);
 
   emit Invalidated(r);
 }
 
 void PlaybackCache::InvalidateAll()
 {
-  QMutexLocker locker(lock());
-
   if (length_.isNull()) {
     return;
   }
 
-  TimeRange invalidate_range(0, length_);
-
-  NoLockInvalidate(invalidate_range);
-
-  locker.unlock();
-
-  emit Invalidated(invalidate_range);
+  Invalidate(TimeRange(0, length_));
 }
 
 void PlaybackCache::SetLength(const rational &r)
 {
-  QMutexLocker locker(lock());
-
   if (length_ == r) {
     // Same length - do nothing
     return;
@@ -85,8 +79,6 @@ void PlaybackCache::SetLength(const rational &r)
   rational old_length = length_;
   length_ = r;
 
-  locker.unlock();
-
   if (r > old_length) {
     emit Invalidated(range_diff);
   } else {
@@ -100,21 +92,19 @@ void PlaybackCache::Shift(const rational &from, const rational &to)
     return;
   }
 
-  QMutexLocker locker(lock());
-
   // An region between `from` and `to` will be inserted or spliced out
   TimeRangeList ranges_to_shift = invalidated_.Intersects(TimeRange(from, RATIONAL_MAX));
 
   // Remove everything from the minimum point
   TimeRange remove_range = TimeRange(qMin(from, to), RATIONAL_MAX);
-  NoLockValidate(remove_range);
   RemoveRangeFromJobs(remove_range);
+  Validate(remove_range);
 
   // Shift everything in our ranges to shift list
   // (`diff` is POSITIVE when moving forward -> and NEGATIVE when moving backward <-)
   rational diff = to - from;
   foreach (const TimeRange& r, ranges_to_shift) {
-    NoLockInvalidate(r + diff);
+    Invalidate(r + diff);
   }
 
   ShiftEvent(from, to);
@@ -123,38 +113,18 @@ void PlaybackCache::Shift(const rational &from, const rational &to)
 
   if (diff > rational()) {
     // If shifting forward, add this section to the invalidated region
-    NoLockInvalidate(TimeRange(from, to));
+    Invalidate(TimeRange(from, to));
   }
 
-  locker.unlock();
-
   // Emit signals
-  emit Validated(remove_range);
-  foreach (const TimeRange& r, ranges_to_shift) {
-    emit Invalidated(r + diff);
-  }
-  if (diff > rational()) {
-    emit Invalidated(TimeRange(from, to));
-  }
   emit Shifted(from, to);
 }
 
-void PlaybackCache::NoLockInvalidate(const TimeRange &r)
-{
-  Q_ASSERT(r.in() != r.out());
-
-  invalidated_.InsertTimeRange(r);
-
-  RemoveRangeFromJobs(r);
-  qint64 job_time = QDateTime::currentMSecsSinceEpoch();
-  jobs_.append({r, job_time});
-
-  InvalidateEvent(r);
-}
-
-void PlaybackCache::NoLockValidate(const TimeRange &r)
+void PlaybackCache::Validate(const TimeRange &r)
 {
   invalidated_.RemoveTimeRange(r);
+
+  emit Validated(r);
 }
 
 void PlaybackCache::LengthChangedEvent(const rational &, const rational &)
@@ -169,6 +139,22 @@ void PlaybackCache::ShiftEvent(const rational &, const rational &)
 {
 }
 
+Project *PlaybackCache::GetProject() const
+{
+  // NOTE: A lot of assumptions in this behavior
+  ViewerOutput* viewer = static_cast<ViewerOutput*>(parent());
+  if (!viewer) {
+    return nullptr;
+  }
+
+  Sequence* sequence = static_cast<Sequence*>(viewer->parent());
+  if (!sequence) {
+    return nullptr;
+  }
+
+  return sequence->project();
+}
+
 void PlaybackCache::RemoveRangeFromJobs(const TimeRange &remove)
 {
   // Code shamelessly copied from TimeRangeList::RemoveTimeRange
@@ -196,23 +182,13 @@ void PlaybackCache::RemoveRangeFromJobs(const TimeRange &remove)
 
 QString PlaybackCache::GetCacheDirectory() const
 {
-  // NOTE: A lot of assumptions in this behavior
-  ViewerOutput* viewer = static_cast<ViewerOutput*>(parent());
-  if (!viewer) {
+  Project* project = GetProject();
+
+  if (project) {
+    return project->cache_path();
+  } else {
     return QString();
   }
-
-  Sequence* sequence = static_cast<Sequence*>(viewer->parent());
-  if (!sequence) {
-    return QString();
-  }
-
-  Project* project = sequence->project();
-  if (!project) {
-    return QString();
-  }
-
-  return project->cache_path();
 }
 
 OLIVE_NAMESPACE_EXIT
diff --git a/app/render/playbackcache.h b/app/render/playbackcache.h
index 881476830..2f857d4c1 100644
--- a/app/render/playbackcache.h
+++ b/app/render/playbackcache.h
@@ -28,6 +28,8 @@
 
 OLIVE_NAMESPACE_ENTER
 
+class Project;
+
 class PlaybackCache : public QObject
 {
   Q_OBJECT
@@ -43,17 +45,13 @@ public:
 
   const rational& GetLength()
   {
-    QMutexLocker locker(lock());
-
-    return NoLockGetLength();
+    return length_;
   }
 
   void SetLength(const rational& r);
 
   bool IsFullyValidated()
   {
-    QMutexLocker locker(lock());
-
     return invalidated_.isEmpty();
   }
 
@@ -61,15 +59,11 @@ public:
 
   const TimeRangeList& GetInvalidatedRanges()
   {
-    QMutexLocker locker(lock());
-
-    return NoLockGetInvalidatedRanges();
+    return invalidated_;
   }
 
   bool HasInvalidatedRanges()
   {
-    QMutexLocker locker(lock());
-
     return !invalidated_.isEmpty();
   }
 
@@ -83,19 +77,7 @@ signals:
   void LengthChanged(const OLIVE_NAMESPACE::rational& r);
 
 protected:
-  void NoLockInvalidate(const TimeRange& r);
-
-  void NoLockValidate(const TimeRange& r);
-
-  const rational& NoLockGetLength() const
-  {
-    return length_;
-  }
-
-  const TimeRangeList& NoLockGetInvalidatedRanges()
-  {
-    return invalidated_;
-  }
+  void Validate(const TimeRange& r);
 
   virtual void LengthChangedEvent(const rational& old, const rational& newlen);
 
@@ -103,12 +85,9 @@ protected:
 
   virtual void ShiftEvent(const rational& from, const rational& to);
 
-  QString GetCacheDirectory() const;
+  Project* GetProject() const;
 
-  QMutex* lock()
-  {
-    return &lock_;
-  }
+  QString GetCacheDirectory() const;
 
   struct JobIdentifier {
     TimeRange range;
@@ -120,8 +99,6 @@ protected:
 private:
   void RemoveRangeFromJobs(const TimeRange& remove);
 
-  QMutex lock_;
-
   TimeRangeList invalidated_;
 
   rational length_;