When using my Mac (OS 10.9.5) and InDesign CS6 (8.0.2) I can place a PDF containing OPI comments, and export it as PDF X1a. It will pop up a warning and I can ok or cancel. When I try to do the same thing on my PC (windows 7 SP1) and InDesign CS6 (8.0.2) it doesn't give me the warning, it just hangs up. Is there anyways to get my PC to give me the same pop-up as my Mac? I've gone through the preferences and it looks like the same settings on both machines.