If you select Macro... under Insert or Help on Command in Help and then move the mouse, if you have the beep activated you'll hear a whole lot of beeps every time you move the mouse.
I think that any command that is executed from the Menu Bars that uses meGetString does it, atleast I've tryed a lot and all of them do it.
Supposedly it is the handleling of the callsbacks from the mouse ...???
It's not severe since, you can work but it's a whole lot annoying ....:=)