A couple of years ago there was a problem when exiting Excel if an add-in was loaded and you used an early version of Google Desktop. When you exited Excel, you would get a pop-up box asking you to type in the password of the add-in.
This is now happening on a PC which does not have Google Desktop. There is an add-in which opens other add-ins. Whenever this add-in is used, which ever add-in was last used comes up on exiting Excel with a pop-up asking for the add-in password. The add-in referenced in the pop-up can be independent of the original add-in which seems to be causing the problem.
Any ideas?