With wipe-outs we have always had mixed results, but 9/10 times it's wrong in the PDF.. we avoid them like the plague. as an alternate option image clipping and xfref clipping.. or.. iembed the image and clip out what you don't want with the raster tools. Wipe-outs tend to be a crutch, and a painful one at that. It seems at times they work on one machine and not on another even thou both machines were set up identically. In any case.. very buggy with adobe.. and it doesn't matter much which PDF driver you use.. it almost seems random weather it works or not.