diff --git a/effects/shaders/crop.frag b/effects/shaders/crop.frag
index 062f22c2f..574360312 100644
--- a/effects/shaders/crop.frag
+++ b/effects/shaders/crop.frag
@@ -7,18 +7,32 @@ uniform float feather;
 uniform mediump float amount_val;
 
 vec4 process(vec4 col) {
-	float alpha = col.a;
+	float alpha = 1.0;
+
+
 	if (feather == 0.0) {
 		if (v_texcoord.x < (left*0.01) || v_texcoord.y < (top*0.01) || v_texcoord.x > (1.0-(right*0.01)) || v_texcoord.y > (1.0-(bottom*0.01))) {
 			alpha = 0.0;
 		}
 	} else {
 		float f = pow(2.0, 10.0-(feather*0.1));
-		if (left > 0.0) alpha = alpha * clamp(((v_texcoord.x+(0.5/f))-(left*0.01))*f, 0.0, 1.0); // left
-		if (top > 0.0) alpha = alpha * clamp(((v_texcoord.y+(0.5/f))-(top*0.01))*f, 0.0, 1.0); // top
-		if (right > 0.0) alpha = alpha * clamp((((1.0-v_texcoord.x)+(0.5/f))-(right*0.01))*f, 0.0, 1.0); // right
-		if (bottom > 0.0) alpha = alpha * clamp((((1.0-v_texcoord.y)+(0.5/f))-(bottom*0.01))*f, 0.0, 1.0); // bottom
+
+		if (left > 0.0) {
+			alpha = clamp(((v_texcoord.x+(0.5/f))-(left*0.01))*f, 0.0, 1.0); // left
+		}
+
+		if (top > 0.0) {
+			alpha = clamp(((v_texcoord.y+(0.5/f))-(top*0.01))*f, 0.0, 1.0); // top
+		}
+
+		if (right > 0.0) {
+			alpha = clamp((((1.0-v_texcoord.x)+(0.5/f))-(right*0.01))*f, 0.0, 1.0); // right
+		}
+
+		if (bottom > 0.0) {
+			alpha = clamp((((1.0-v_texcoord.y)+(0.5/f))-(bottom*0.01))*f, 0.0, 1.0); // bottom
+		}
 	}
 
-	return vec4(col.rgb*alpha, alpha);
+	return col * alpha;
 }
\ No newline at end of file
diff --git a/effects/shaders/flip.frag b/effects/shaders/flip.frag
index 6a55cc8ca..6bdb05a9c 100644
--- a/effects/shaders/flip.frag
+++ b/effects/shaders/flip.frag
@@ -1,23 +1,14 @@
-#version 110
-
 uniform bool horiz;
 uniform bool vert;
 
-uniform sampler2D myTexture;
-varying vec2 vTexCoord;
+vec4 process(vec4 col) {
+	float x = v_texcoord.x;
+	float y = v_texcoord.y;
 
-void main(void) {
-	float x = vTexCoord.x;
-	float y = vTexCoord.y;
+	if (!horiz && !vert) return col;
 
 	if (horiz) x = 1.0 - x;
 	if (vert) y = 1.0 - y;
 
-	vec4 textureColor = texture2D(myTexture, vec2(x, y));
-	gl_FragColor = vec4(
-		textureColor.r,
-		textureColor.g,
-		textureColor.b,
-		textureColor.a
-	);
+	return texture2D(texture, vec2(x, y));
 }
\ No newline at end of file
diff --git a/effects/shaders/gaussianblur.frag b/effects/shaders/gaussianblur.frag
index ab015051f..e1d08a367 100644
--- a/effects/shaders/gaussianblur.frag
+++ b/effects/shaders/gaussianblur.frag
@@ -1,11 +1,5 @@
 #define M_PI 3.1415926535897932384626433832795
 
-<<<<<<< HEAD
-=======
-uniform sampler2D image;
-
-//uniform float radius;
->>>>>>> master
 uniform float sigma;
 uniform vec2 resolution;
 uniform bool horiz_blur;
diff --git a/rendering/renderfunctions.cpp b/rendering/renderfunctions.cpp
index 806ab318d..69b098372 100644
--- a/rendering/renderfunctions.cpp
+++ b/rendering/renderfunctions.cpp
@@ -573,16 +573,22 @@ GLuint olive::rendering::compose_sequence(ComposeSequenceParams &params) {
 
             // use clip textures for nested sequences, otherwise use main frame buffers
             GLuint back_buffer_1;
+            GLuint back_buffer_2;
             GLuint backend_tex_1;
             GLuint backend_tex_2;
+            GLuint comp_texture;
             if (params.nests.size() > 0) {
               back_buffer_1 = params.nests.last()->fbo[1].buffer();
+              back_buffer_2 = params.nests.last()->fbo[2].buffer();
               backend_tex_1 = params.nests.last()->fbo[1].texture();
               backend_tex_2 = params.nests.last()->fbo[2].texture();
+              comp_texture = params.nests.last()->fbo[0].texture();
             } else {
               back_buffer_1 = params.backend_buffer1->buffer();
+              back_buffer_2 = params.backend_buffer2->buffer();
               backend_tex_1 = params.backend_buffer1->texture();
               backend_tex_2 = params.backend_buffer2->texture();
+              comp_texture = params.main_buffer->texture();
             }
 
             // render a backbuffer
@@ -679,11 +685,7 @@ GLuint olive::rendering::compose_sequence(ComposeSequenceParams &params) {
 
             // copy front buffer to back buffer (only if we're using a blending mode)
             if (coords.blendmode >= 0) {
-              if (params.nests.size() > 0) {
-                draw_clip(params.ctx, params.pipeline, params.nests.last()->fbo[2].buffer(), params.nests.last()->fbo[0].texture(), true);
-              } else {
-                draw_clip(params.ctx, params.pipeline, params.backend_buffer2->buffer(), params.main_buffer->texture(), true);
-              }
+              draw_clip(params.ctx, params.pipeline, back_buffer_2, comp_texture, true);
             }
 
 
diff --git a/rendering/renderthread.cpp b/rendering/renderthread.cpp
index f9699a220..352224d36 100644
--- a/rendering/renderthread.cpp
+++ b/rendering/renderthread.cpp
@@ -255,6 +255,7 @@ void RenderThread::paint() {
 
     // If we're not color managing, just blit normally
     buffer.BindBuffer();
+    f->glClear(GL_COLOR_BUFFER_BIT);
     composite_buffer.BindTexture();
     olive::rendering::Blit(pipeline_program.get());
     composite_buffer.ReleaseTexture();