All of a sudden I can't view existing pdf's that I've always been able to read before. They open, but present as all-grey pages. Not for all my pdf's--seems to only be those docs that had originally been scanned and saved as pdf (which I received from the person who scanned them). Can you help me fix?
I'm using Acrobat 10.1.5; it appears to me they were saved with Acrobat "5.x".