I'm not using an external mouse-over tga, and the alpha information matches up perfectly. I tried putting extra spaces between my small icons too, thinking maybe they were too close and that a 'bleed over' of sorts was occurring, but that still hasn't done any good. Maybe there is a size limit for small icons that I'm narrowly stepping over the limits of. But it seems like the same problem a guy was having on the last page of this thread though he never replied back that he got it fixed or gave up.