PC Gs v.4.10 WKM I had no problem to setup waypoints and specify way point heading degrees until today (both in simulated and real mode). Every thing worked well. But today I planned a mission and configured waypoint headings in some degree and started the mission in simulated mode. The aircraft totally ignores heading degrees specified by me and flies some how random headings. Yaw is totally uncontrolled. even if I flip switch from GPS-ATT to ATT and back to regain the control of the aircraft I can control Pitch and Roll by the Radio but not the Yaw. The Yaw stick does not work at all. I reinstalled drivers and software, same issue. Any help is appreciated since I have to do a mapping job the day after tomorrow and the aircraft should absolutely follow specified track to be able to take pictures properly and on time.