Closing MP with Alt+F4 (in fullscreen mode) makes Windows "lose" the start menu bar. It's gone and the background goes all the way down. Starting MP again and minimizing it will restore the bar but I usually connect with remote desktop to my HTPC and it's annoying not having the bar during the session.
I'm guessing something isn't uninitialized properly.
I'm guessing something isn't uninitialized properly.