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On 01/05/2016 16:27, Santhosh G wrote: > Dear All > > In COOT Ctrl Z and Undo, both are is not working. > > Can U give suggestions to fix it. > This is not a good bug report. You need to provide extra information 1) which OS are you using? 2) which Coot binary are you using? 3) what does the terminal say? FWIW, I suspect that 3) will provide the answer for you. Paul.