Hi there. I have the same issues as described above. Running p3d with FSUIPC6 and prosim737. It went from working flawless to not retracting after T/O. The hardware (FDS MiP) seems to work. Prosim recognizes the position of the gear lever as well as correct sequence of indicator lights etc. However the gear stays down with the retraction audio on repeat. Only way I can get the gear to move is by keeping the G key pressed and slowly it retracts, until I release it and the gear drops again. I cant say exactly when it started happening, the only one change to the setup I can think of was updating FSUIPC5 to 6. Any suggestions are highly appreciated. Its driving me mad!
Cheers