I loaded CAD Map 2011 a few weeks ago.  I can use it for about 30 mins before my esc key stops working.  Simple commands also stop working.  When I close and re-open everything works fine for about 30 mins. When I do close I always get a fatal error.  "Unhandled Access Violation Reading 0xfffffff ( not sure if that is enough f's) Exception at 3ff35af7h.What should I do about the error and the loss of functionality with in CAD?Re-install?Thanks for the help.