I'd bet money its an Adobe issue.
Adobe Acrobat is complete ******** and anyone who says otherwise never worked in IT.
The last job I worked at, our company purchased Acrobat 8 shortly before 9 came out. Not only did some machines it not even work on, but it would constantly crash, go corrupt, or screw up things it shouldn't even be touching (outlook, internet explorer, MS Office). After months back and forth with Adobe (and seeing online that we were not even close to the only ones with problems) Adobe's only solution was to "Upgrade to Acrobat 9". We had abour 50,000 computers that would have needed the upgrade immediately and it would have been all at our companies expense.
Sorry for the rant but I get angry when I hear adobe.