Acrobat Update Causing Problems for Mac InDesign and Illustrator Users
Over the last couple of weeks there was a sudden rash of complaints in the Adobe User to User forums (here's one such thread) about InDesign and Illustrator prompting the user to reenter their serial number.
Even doing so, resulted in the application hanging. Adobe is now aware of the issue and has found the problem to be with the Acrobat 8.2 update. A TechNote with a fix, has been issued but it may only be temporary and the problem could rear its ugly head again at any time.
According to the TechNote, this only affects CS and CS2 users on OSX but a report of a similar problem was posted from an InDesign 2.0.2 user yesterday.
I'll be keeping an eye on this will update the post if something permanent is found.
Feb 2 Update: A few users have reported that this problem also applies to InDesign 2.0 and that the fix mentioned in the TechNote fixes it.