That's the first thing I do - a restart - anytime I encounter some weird-ass, no-rhyme-or-reason glitch/gremlin that just randomly appears out of nowhere. I figure something just got momentarily scrambled or flaked-out, and it's rare, in my experience, that a quick restart doesn't do the trick for little things like that. Just seems to give the system a good Moe Howard slap and set things right.
