No 'Undo' in 3_D

While working with 3d elements, I notice that there appears to be no 'undo'. Following an operation, usually a move command, if it is wrong for what ever reason, when I attempt to 'undo' I get the message "nothing to undo" and an empty command line and a complete 'hang' leaving the only option but to close (via CTRL-ALT-DEL) and restart. Perhaps if I left it for a long period it might possibly come back to life since the Task Manager window suggests that the program is still running, but I haven't really the time!Has anybody any suggestions.

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