i m using X-Plane 10 and i bought Pa-28 , PA32, and c-150 . On Pipers, flaps are unavaiable without master on, that's not true in real.
We've tried to address this, but it seems to be an X-Plane glitch. Please report this to Laminar. In fact, even the planes with mechanical flaps that are included in X-Plane have the same glitch (for instance, the Stinson L5).