When you hover your mouse over a ribbon icon, some of them will automatically invoke a help movie (animation) below the icon in a small window. When I do this, the movie plays to its conclusion, but the window stays open (as a black square) and it won't close. If you hover multiple times, all of the black windows stay open. They all stay on top of everything, nothing happens if you click within the window. The only way they will close is if you close Publisher and restart it.
Running Win7 and Pub 2012 (Ultimate Design Suite installed).