3a369128b43a9d19846151de8a37e8a07ca2f423
disabling GL_Blend at the 2dfilter drawing routine makes the trick here. there is not a clear function invoked before the 2dfilter drawing routine. Therefore I found better to disable alpha blending while we are setting the other OpenGl attributes/matrixes. We are not re-enabling GL_BLEND after we disable it. We could and it wouldn't hurt but I can't see why to. open to suggestions here of course.
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