I'm going to agree with James on this. Depending on what is being wiped out, I'd suggest a ****-up version of clipping. If the wipeout is over an xref or image file, create a clip boundary that uses a very small space (.001 seems to work in most cases) to the area to clip then go to the modify pull down, clip, image or xref (which ever is to be wiped out). I'll admit, this is a work around, but it does get rid of the wipeout for most situations.
Jason Mehlhop
Freelance AutoCAD User & Customizer
jasonmehlhop@adelphia.net