OmniGraffle is the problem (as far as your issue is concerned). Like most business-related programs, it works in RGB. Its drop shadows are RGB and pixel-based, so Illustrator can convert the RGB to CMYK, but it can't change a the resulting CMYK shadow to grayscale/K-only shadow.
The easiest thing to do is upgrade to a newer version of Acrobat. You can convert the entire document to grayscale, removing the CMY seps. (I don't remember if version 6 can do that or not--it has been too long since I used that version.) PDF/X-3 will not solve your problem as it does not convert color. As an aside, I would either make a commitment to FrameMaker or to the Mac. If FrameMaker--get a Windows computer, run Boot Camp on the Mac, or get Parallels (or similar program) to run Windows on your Mac. For the latter two, you may need a newer Mac, especially for the last option. Then upgrade FrameMaker and Acrobat. If you want to say strictly Mac, consider using InDesign (and still upgrade Acrobat). David Creamer IDEAS Training http://www.ideastraining.com Adobe Authorized Instructor & Certified Expert since 1995 Authorized QuarkXPress Instructor and Certified Expert since 1988 -----Original Message----- From: Steve Rickaby [mailto:srick...@wordmongers.demon.co.uk] Sent: Thursday, December 15, 2011 5:29 AM To: David Creamer Cc: framers at lists.frameusers.com Subject: RE: Removing extraneous color channel information Importance: High At 15:24 -0800 14/12/11, David Creamer wrote: >Where did you create the drop shadows? In AI? Author's graphics, done in OmniGraffle on Mac. >What format did you save the AI files as? PDF. >What were your PDF settings? If you mean from Illustrator, as in PDFX/1 etc, none. If you mean Distiller, print quality standard but I'm working towards PDF/X-3. >What version of Acrobat Pro do you have? 6 >(I noticed you are using Distiller 6--is your Acrobat the same version?) Yes -- Steve