I just had a very odd glitch pop up. Nothing major, it's cleared up now and I'm not worried, but wanted to share because it was actually kinda funny. I was using my computer, TextEdit open in the background from something I was doing earlier, and I noticed the following:

See the little drop-down menu on the bottom left? It worked, although the menu it created popped up an inch or so above it. When I clicked on it, TextEdit became the active application, and when I quit TextEdit it disappeared (and didn't reappear when I relaunched TextEdit), so it was obviously from there, but that menu, AFAIK, is buried in the preferences somewhere, not visible on any window I've opened since I got my computer, until after this happened and I was searching for where it came from. Very odd.
jW

See the little drop-down menu on the bottom left? It worked, although the menu it created popped up an inch or so above it. When I clicked on it, TextEdit became the active application, and when I quit TextEdit it disappeared (and didn't reappear when I relaunched TextEdit), so it was obviously from there, but that menu, AFAIK, is buried in the preferences somewhere, not visible on any window I've opened since I got my computer, until after this happened and I was searching for where it came from. Very odd.
jW