Filter not working in After Effects

Hi there,
I've improved my Sobel Edge Detection Filter a little bit and tried to use it in After Effects on some video material. But to no avail. It simply outputs a black frame. In Photoshop and Pixel Bender itself it works like a charm. But not in AE. Could somebody please tell me why?
Here's the code: http://pastebin.com/TUbiGFND
Thanks a lot!
Greetings,
Hendrik

Pixel Bender and After Effects act totally oddly. I really don't get it.
I have been trying the following lately:
define two parameters float3x3 to replace the constant matrices in the edgeX and edgeY functions by two dynamic ones. They are not editable in after effects but behave differently from the constantly defined matrices although they have the same values. With two (uneditable) parameters I can see some effect in AE that is different from the one in Pixel Bender IDE but at least there is something happening. I get completely white frames which I can turn into something visible by turning down the parameters Bias (to zero) and Factor (to something less than five or so). With constantly defined matrices inside the functions edgeX and edgeY nothing happens. The image simply stays black.
Where is the difference between a parameter float3x3 and a local variable float3x3 with absolutely and definitely the same values? And why does AE act differently from Pixel Bender IDE?
I also have been playing around with region reasoning functions needed and changed but I can't by the life of me get any results by altering them. Not even any negative results. They seemingly do nothing.

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