I have been using ls for only a few weeks and installed RC2 originally. I had experienced the freezing problem and looked thru the forums for a solution. RC3 beta listed this a resolved. The freezing occurs only after the system has been locked (either by manually locking or screensaver). I am using the default theme. What I have found is that the taskbar and poup menu's are unavailable. To resolve the freezing I have found that if I Ctrl+Alt+Del (which brings up the Windows Security window) the hit Esc (to return back to the desktop) and IMMEDIATELY right click to bring up the popup menu. If the popup menu doesn't appear I repeat the process until it does. If anyone knows what I can try or if I simply missed something please let me know.