Total disbelief here... had a beautiful desktop based on Zen and been tidying up the Main Menu using the 'alacarte' menu editor. Been doing this in dribs & drabs over some weeks... never been a problem and well pleased on how I can get a minimal look to the menu. I recently done another tweak as in hiding menu entries under "Administration" since they also appear under Gnome Control Centre which is a lot prettier and silly to have two listings of the same.
The changes took immediate effect and just what I wanted, and I shutdown the system quite pleased with myself! Now it suddenly boots to an almost frozen desktop... unresponsive other than mouse, desktop icons missing, some panel icons missing all frozen. The png background still OK, Compiz can still rotate the cube to the 3 other desktops OK, but no more than that.
Ctrl+Alt+F2 brings in a black screen of nothing. REISUB will reboot for a repeat performance, and booting into Safe Mode now goes nowhere!
Any ideas??? I thought I was starting to get the hang of Linux but now I'm completely flummoxed!