Revit froze and shut down with an "unrecoverable error occurred" message. Upon reopening the program (any file, or the program itself) the error message appears at startup and program shuts down again. I already installed the 2011 update rac_x86_ur10exe and it doesn't make a difference. When I log on as administrator I can open the program fine but switching back to the user I get the message again. I've rebooted and did a basic reinstall and still get the same message again and again. Any ideas?