I've had something really weird happen to my 12.04. I was installing new desktop environments, and now I have no sound through my headphones and the "pop up" theme has changed. by pop up, I mean the icons that appear when I use hot keys to do things like change volume, brightness, etc.
I first noticed this change after I left my computer on, but was away from it. I hadn't logged out of my session, but the theme changed when I woke back up from suspend. The only other thing I had done was the regular update stuff with update manager.
So, the question is how do I go back to how it was this morning? At the very least, I can deal with the icons being different, but I need sound out my headphone jack! here's a pic