I recently hit this weird bug in iOS 4.3.3 on iPad. When it was locked, the "Team Provisioning Profile is expiring in N days" popup popped up and I wasn't able to dismiss it by hitting the two buttons of the popup itself. The only way I could regain access to the device was to restore it. Now I upgraded to 4.3.4 and hopefully the bug should be gone, but I didn't find anything like that in the changelog of the upgrade.
The device's log didn't show anything unusual, and I couldn't even turn the iPad off and on again because said popup is modal and you need to slide to confirm poweroff.
Did anybody hit the same misbehaviour? I couldn't find anything relevant on the Internet.