diff --git a/app/node/project/footage/footage.cpp b/app/node/project/footage/footage.cpp
index 6d447cade..c03805191 100644
--- a/app/node/project/footage/footage.cpp
+++ b/app/node/project/footage/footage.cpp
@@ -22,6 +22,7 @@
 #include "footage.h"
 
 #include <QApplication>
+#include <QDebug>
 #include <QDir>
 #include <QStandardPaths>
 
@@ -229,12 +230,24 @@ void Footage::SetSourceStartTime(const rational &time, const QString &source)
 	has_source_start_time_ = true;
 }
 
+void Footage::set_proxy_enabled(bool enabled)
+{
+	if (proxy_enabled_ != enabled) {
+		qDebug() << "Footage::set_proxy_enabled:" << filename() << enabled;
+		proxy_enabled_ = enabled;
+		emit ProxySettingsChanged();
+	}
+}
+
 void Footage::SetProxy(const QString &path,
 					   ProxyManager::ProxyState state,
 					   int video_stream_index,
 					   int preset_version,
 					   bool enabled)
 {
+	qDebug() << "Footage::SetProxy:" << filename() << "enabled=" << enabled
+			 << "state=" << ProxyManager::ProxyStateToString(state)
+			 << "path=" << path;
 	proxy_path_ = path;
 	proxy_state_ = state;
 	proxy_video_stream_index_ = video_stream_index;
diff --git a/app/node/project/footage/footage.h b/app/node/project/footage/footage.h
index 13497aa1b..9e697135d 100644
--- a/app/node/project/footage/footage.h
+++ b/app/node/project/footage/footage.h
@@ -178,13 +178,7 @@ public:
 		return proxy_enabled_;
 	}
 
-	void set_proxy_enabled(bool enabled)
-	{
-		if (proxy_enabled_ != enabled) {
-			proxy_enabled_ = enabled;
-			emit ProxySettingsChanged();
-		}
-	}
+	void set_proxy_enabled(bool enabled);
 
 	const QString &proxy_path() const
 	{
diff --git a/app/render/projectcopier.cpp b/app/render/projectcopier.cpp
index a17dff942..cc406cc6d 100644
--- a/app/render/projectcopier.cpp
+++ b/app/render/projectcopier.cpp
@@ -278,9 +278,16 @@ void ProjectCopier::SyncFootageProxySettings(Footage *source)
 {
 	Footage *copy = GetCopy(source);
 	if (!copy) {
+		qWarning() << "ProjectCopier::SyncFootageProxySettings: no copy for"
+				  << source->filename();
 		return;
 	}
 
+	qDebug() << "ProjectCopier::SyncFootageProxySettings:" << source->filename()
+			 << "enabled=" << source->proxy_enabled() << "->"
+			 << copy->proxy_enabled() << "state="
+			 << ProxyManager::ProxyStateToString(source->proxy_state());
+
 	copy->SetProxy(source->proxy_path(), source->proxy_state(),
 				   source->proxy_video_stream_index(),
 				   source->proxy_preset_version(), source->proxy_enabled());
diff --git a/app/render/renderworkerpool.cpp b/app/render/renderworkerpool.cpp
index b67ba2ad9..5e8ba6ab2 100644
--- a/app/render/renderworkerpool.cpp
+++ b/app/render/renderworkerpool.cpp
@@ -573,8 +573,12 @@ bool RenderWorkerPool::PrepareJob(RenderTicketPtr ticket,
 		auto it = graph_cache_.find(project_uuid);
 		if (it != graph_cache_.end() && !project->is_modified()) {
 			graph_path = it->path;
+			qDebug() << "RenderWorkerPool::PrepareJob: using cached graph snapshot"
+					 << graph_path;
 		} else {
 			if (it != graph_cache_.end()) {
+				qDebug() << "RenderWorkerPool::PrepareJob: graph stale, rewriting"
+						 << project->is_modified();
 				CleanupGraphFile(it->path);
 				graph_cache_.erase(it);
 			}
diff --git a/app/widget/timelinewidget/timelinewidget.cpp b/app/widget/timelinewidget/timelinewidget.cpp
index 0313510a9..59a1bca1b 100644
--- a/app/widget/timelinewidget/timelinewidget.cpp
+++ b/app/widget/timelinewidget/timelinewidget.cpp
@@ -1216,8 +1216,12 @@ void TimelineWidget::GenerateProxiesForSelectedClips()
 void TimelineWidget::SetSelectedClipsProxyEnabled(bool enabled)
 {
 	const QVector<Footage *> footage = GetSelectedProxyFootage(selected_blocks_);
+	qDebug() << "TimelineWidget::SetSelectedClipsProxyEnabled:" << enabled
+			 << "footage count=" << footage.size();
 	for (Footage *item : footage) {
 		if (item->proxy_path().isEmpty()) {
+			qDebug() << "  skipping item with empty proxy path"
+					 << item->filename();
 			continue;
 		}