Yaw no respond

[monkey1]

The quad just finished calculate and tuning the PID. Every direction of quad flight at normal. However, there is no respond of Yaw when i move the yaw stick. Look at the QGC, RC radio, it shows the yaw working value normally from 671 to -671. Yaw rate I already set to 0.2. Very strange, any advise?

[gionag]

look if you have engaged the RTH switch.
in my experience, when you have rth active, the yaw not respond anymore. (refv. 6.6r37)