Can't add a new contact in Office Communicator

Question

This is silly, but when I click Add Contact in Office Communicator nothing happens, the main Communicator window just loses focus.

Has anybody encountered that?

Yesterday it worked fine.

[Edit] Hmm.. Actually, no dialog opens, not even the Options dialog.

Answer 1

Looks like the culprit in my case was TeamViewer. When I shut it down, all the dialogs work again.