diff -r 8184f75a63d4 -r 67584cc761d1 mdfdevvideoextensions/nga_mdf_postprocessor/src/NGAPostProcHwDevice.cpp
--- a/mdfdevvideoextensions/nga_mdf_postprocessor/src/NGAPostProcHwDevice.cpp	Tue May 11 17:37:08 2010 +0300
+++ b/mdfdevvideoextensions/nga_mdf_postprocessor/src/NGAPostProcHwDevice.cpp	Tue May 25 14:20:15 2010 +0300
@@ -1426,7 +1426,7 @@
 	if(!aSurfaceId.IsNull())
 	{
 		PP_DEBUG(_L("CNGAPostProcHwDevice[%x]:MmvssSurfaceRemovedL(): UnregisterSurface ID = 0x%x"), this, aSurfaceId );
-		iWsSession.UnregisterSurface(0, iSurfaceId);
+		iWsSession.UnregisterSurface(0, aSurfaceId);
 		iSurfaceHandler->DestroySurface(aSurfaceId);
 	}