The attached file doesn't convert correctly using gs head compared to Acrobat 7.0. Raph suggests a conflict between overprint and transparency.
Because of the large size the test file can be found in casper.ghostscript.com://home/support/688952/ PDF-native.pdf
The problem has been verified that it is related to the combination of PDF 1.4 transparency and overprinting.
retest and reassign.
This is a duplicate of 689880. I have put a test case with that bug. *** This bug has been marked as a duplicate of 689880 ***