I was editing a file and applying materials to various objects utilizing the property panel material editor. I was assigning materials to objects individually. Once I completed assigning materials I went to use a command (I cant recall which and it does not actually matter).
When I pre-selected the object I wanted to act on, the property panel jumped back to the material editor (no big deal, happens in 5 all the time). However, when I went to enter a command I heard the windows default beep noise and no typing occurred in the command bar. Seems like a bug to me?