Blur

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Rimmsy

I'm attempting to blur the entire screen by:

cameraviewport camera,0,0,256,256
renderworld
copyrect 0,0,256,256,0,0,backbuffer(),texturebuffer(blur)

but it produces a blur which is offset slightly dependant on the camera pitch. What am I doing wrong here? I tried changing the texture dimensions to 320,200, but it doesn't help.