I removed the gimbal from my P2 yesterday and also upgraded the NAZA software enabling IOC. But when I connected the Zenmuse the rear controller for tilt no longer works. Any help appreciated!
Go into the phantom assistant (not the controller one) with your phantom and controller on and then calibrate the X1 switch. You may have to move the switch multiple times to get the calibration right.
I had something similar happen (it moved only a tiny bit) and once I calibrated the x1 it has been fine.