I just installed a fresh copy of Lion, and occasionally have errors with it. I have two desktops set up, and every time I use mission control it isn't properly launching. It basically is just doing App Expose.
Here is a picture.
Notice there is no grey border or any option to switch to another desktop via mission control with gestures.
Here is a picture.
Notice there is no grey border or any option to switch to another desktop via mission control with gestures.