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Do you use a wireless mouse and/or keyboard? (and do the other "similar installations" not? ) if so, read above and switch to wired devices if that is practicable for you. Info on wireless usage would be of interest to all...
I'm relatively new to Mathematica, and whilst I am in awe of its fundamental mathematical capabilities, the lack of front end support for multiple levels of undo is an equally aweful oversight. If I, as a relative beginner, am already so frustrated...