I tried this on my system with 32 bit WinCMES and this seems OK, however this could be the result of a zapped or suppressed line. Try entering the command from the keyboard and seeing what data it prompts you for (UP,29\AF,PP,//). If you don't get a prompt try a LD to list dimensions and see if 1,2,3 (Axis X,Y,Z) are disabled. If any are disabled type UD,1,2,3 to enable or SL if you have been using SL,1,2,3. Good Luck.