Can't change radio frequencies

I have a friend who can't change the radio frequencies on his default radio stacks after installing some default repaints. At this time he has to switch to a non default aircraft to change the frequencies then switch back to the default plane. Even though he installed repaints of the fs2002 large jets this problem even affects his cessna's. I suggested that he check his aircrafts cfg for the proper radio cfg and even sent him the default radio gauge all to no avail.Short of a reinstall does anyone have any ideas as to what may be causing his problem? :-zhelpThanks for any input!Skully:-wave