Interesting to learn that an uninstall/reinstall doesn't fix this problem. I've already found that none of the Adobe patches helped. Acrobat 5 worked fine a week ago, but has suddenly acqired this glitch. No software installs corresponding to the date. (I did allow a bootup-notification Flash update to install recently, however.) I'd sure like to know what broke AA5, and how to repair it. The closest I've come to finding a solution is exacting the entire range of pages as a new Acrobat document, closing the original, and saving the new document as the repalcement. The new document DOES allow page deletions. It's a hassle, though, for an error that shouldn't even be happening in the first place.