I also found this thread which describes the same problem with the flaps. Search for "A couple of annoying 707 problems". Apparently I'm not allowed to post links  :( :( :(

I've uninstalled, re-downloaded and re-install this airplane. I also updated to latest FSUIPC and assigned joystick control buttons to increment/decrement flaps. I tried loading the predefined flight -- ready for takeoff at KSEA.

None of the above helps. At the start, flaps are 0, but if I increment flaps they go straight to 50. Flaps decrement causes the flaps to toggle between 40 and 50. I can move flaps to 14 with the mouse, but the flaps don't change -- the flaps gauge and the flaps themselves remains at 50.

Also I don't understand why I can't start a new topic in this forum.

:(  :( :( :(