Using Acrobat XI Pro on my Dell PC, I was trying to add password protection to the document. When I click on the "encrypt with password" button, the password security-setting dialogue box pops up, and I can enter the password. However, the bottom of the page is not visible and I can't move it to click the "ok" button. Any suggestions?
Which Acrobat XI Pro are you using? I think you experience the same problem that was reported on this forum in the past. I believe this problem was fixed in one of the recent versions (11.0.07??). Upgrade to the latest version and the problem should go away.