We have been experiencing a strange RIP problem since CS3. When we create pdf files for imposition to send to our RIP, everything will look fine. However, when it goes "completely" through the RIP and creates the epson print out for proof, these strange filled in balls or circles will appear randomly throughout the document. These do NOT show up in the pdf file itself, only upon going through the RIP. I have so far figured out that this occurs from an In-Design file when using a one font, say univers bold, then space or tab using a different font like new baskerville which will be the next font used within the paragraph (like a headline using the bold, then the text using the plain version of a completely different font). The mystery "balls" will show up where the spaces or tab is. If I change the spaces or tabs to the first font (univers bold) and then re-create the pdf file, the problem disappears. This is a random occurrence however and will not even show up in every instance where the fonts have been applied so it truely is a mystery. Our RIP software is Xenith/Xitron and this has occurred since Leopard. We are currently using Snow Leopard and the issue is still happening.