You use a multi-function printer as a proofing device? Drivers for these thing are notioriously buggy. Short term solution is to use Preview, or go back to Acrobat 7, or use Print as Image in Acrobat 8
If you own Acrobat, I'm not sure why you need Ghostview. However, if
introducing ghostview causes problems with Acrobat, why do you think
it is Adobe's problem to fix it. Perhaps you should go to the
Ghostview support and have them fix it, so that it doesn't cause
problems with other people's software.