SFX - 2010-06-23

it seems that every once in a while all the shortcut keys i have set get overwritten by the defaults and i have to set them all back again.
does anyone know of any reason this would happen and how i might be able to prevent it?
even if not, is there a way to backup all my settings instead of having to manually configure it again every time it resets? i have looked but haven't been able to find anything.

thanks in advance,