Recently, I faced a strange behavior while applying filter concurrently.
Suppose that you have a button that select a filter and the code contains:
WriteableBitmap writeableBitmap = new WriteableBitmap(Image.PixelWidth, Image.PixelHeight);
The RenderToBitmapAsync generates an immediate exit without generating any exceptions.
To fix this problem, I restrict to process a filter one at a time.