This is a problem I've experienced on files that have no security settings. I've tried uninstalling the app by simply removing the folder in "Applications" and I've also tried to remove the app by using a utility like AppDelete. In either case, reinstalling the app does not fix the problem. This is a problem only on machines running the 10.5.x operating system; I can print from Acrobat Reader on my old 10.4.x machines.