Unable to edit KDE menu

[Piers Kittel <debian@biased.org>]

Hello all,

Just installed KDE on my work and home PCs to test it out - while I can 
edit the KDE menu at work, I can't edit the KDE menu at home - I open up 
"KDE Menu Editor", make the changes, save it, and then exit, but find 
the menu hasn't changed at all, and reloading KDE Menu Editor shows that 
the changes hasn't been done, though new icons I make are put in "Lost + 
Found".

I suspect it's related to me having a trimonitor setup - can anyone help?

Thanks very much for your help in advance

Cheers - Piers