diff --git a/src/gl/renderer/gl_postprocess.cpp b/src/gl/renderer/gl_postprocess.cpp
index 5ccacf305..a8e5867c9 100644
--- a/src/gl/renderer/gl_postprocess.cpp
+++ b/src/gl/renderer/gl_postprocess.cpp
@@ -76,7 +76,11 @@
 //
 //==========================================================================
 CVAR(Bool, gl_bloom, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG);
-CVAR(Float, gl_bloom_amount, 1.4f, 0)
+CUSTOM_CVAR(Float, gl_bloom_amount, 1.4f, 0)
+{
+	if (self < 0.1f) self = 0.1f;
+}
+
 CVAR(Float, gl_exposure, 0.0f, 0)
 
 CUSTOM_CVAR(Int, gl_tonemap, 0, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
@@ -145,6 +149,7 @@ void FGLRenderer::BloomScene()
 	mBloomExtractShader->Bind();
 	mBloomExtractShader->SceneTexture.Set(0);
 	mBloomExtractShader->Exposure.Set(mCameraExposure);
+	mVBO->BindVBO();
 	mVBO->RenderScreenQuad();
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
@@ -242,6 +247,7 @@ void FGLRenderer::TonemapScene()
 	mTonemapShader->Bind();
 	mTonemapShader->SceneTexture.Set(0);
 	mTonemapShader->Exposure.Set(mCameraExposure);
+	mVBO->BindVBO();
 	mVBO->RenderScreenQuad();
 
 	if (blendEnabled)
@@ -351,7 +357,8 @@ void FGLRenderer::CopyToBackbuffer(const GL_IRECT *bounds, bool applyGamma)
 			mPresentShader->Brightness.Set(clamp<float>(vid_brightness, -0.8f, 0.8f));
 		}
 		mBuffers->BindHudTexture(0);
-		mVBO->RenderScreenQuad(width / (float)mBuffers->GetWidth(), height / (float)mBuffers->GetHeight());
+		mVBO->BindVBO();
+		mVBO->RenderScreenQuad(mScreenViewport.width / (float)mBuffers->GetWidth(), mScreenViewport.height / (float)mBuffers->GetHeight());
 
 		if (blendEnabled)
 			glEnable(GL_BLEND);