Pushbackand flap problems

Sorry if this is a little off topic but I was hoping someone would be able to help!!!
For some unknown reason, I can no longer activate pushback (on FS2002) using shift+p - nothing happens - can anyone explain why this is? I have tried it on the default planes as well as newly installed once and it worked before but now nothing!
Also, I can't use F6/F7 to extend and retract flaps gradulally on any plane. I have to use one of the buttons on my joystick to extend then F5 to fully retract. Again, all these worked fine before but suddenly have stopped - any ideas? Thanks!!
For some unknown reason, I can no longer activate pushback (on FS2002) using shift+p - nothing happens - can anyone explain why this is? I have tried it on the default planes as well as newly installed once and it worked before but now nothing!
Also, I can't use F6/F7 to extend and retract flaps gradulally on any plane. I have to use one of the buttons on my joystick to extend then F5 to fully retract. Again, all these worked fine before but suddenly have stopped - any ideas? Thanks!!