From time to time, whenever I open a window, selecting the Shut Down option, or doing any other normal operation with the desktop, my screen will flicker for a split second and then come back with the system tray and menu bar completely gone. Any open/active windows will also be missing their closeout or minimize options as well. Is this a known issue with Mint 12? There have been times where the screen flickers for a split second and when it comes back, everything is ok and back to normal.
I'm running the 64 bit version of Mint 12. I also have a Radeon 6850, with the latest drivers installed.