Pixel bender rendering inside flash is different than preview in Toolkit 2.5

Hello, I'm from Barcelona, Spain and my english is not good

I'm doing with Pixel Bender Toolkit 2.5 a shader for using it in flash as blend mode.

It's strange, but in the preview with loaded images inside is correct, just like I want.

But when I export this pbj to use inside flash it renders different.

I test a simple shader with this sentences:

if(outCoord().x == outCoord().y){

     result = pixel4(0.0,1.0,0.0,1.0);
}else{

     result = sampleNearest(background, outCoord());

}

In Toolkit draws a diagonal line (correct), but in flash outCoord().x == outCoord().y always returns true.

Do you know why this is posible??

Could you help me? Pleeeease

Thanks

Eduardo Galan