I was surfing the interwebs and I stumbled across this on the Apple support forums, "31.07.12 14:30:00,619 Dock: find_shared_window: WID 879 31.07.12 14:30:00,619 Dock: CGSGetWindowTags: Invalid window 0x36f". -posted by sweet-jane. Could a potential fix be made knowing this console error? It appears to be something with a dock. I did see a thread that advertised a fix by making sure you had no stacks on your dock, but that didn't seem to do it for me. Also, sweet-jane mentioned that console does not output that error when switching using the keyboard, rather than the gestures.