Paddy
There are several threads/suggestions at Ubuntuforums.org about this problem. Could be that the best approach would be to give those suggestions a shot, and then if necessary go to the LQ ubuntu forum here (if you list those things that you have tried that didn't work it might give someone a clue).
In fact, if you find the solution, what would really be cool would be if you posted that solution in both forums (LQ & Ubuntuforums).
Don't remember what distro, but I ran into this problem once-upon-a-time. Created a new user and menu edit worked fine there. No idea what the problem was.
Good Luck!
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