The copter does not takeoff in Guided mode and EKF_GPS_TYPE = 3 (optical flow)

2017-04-21 21-58-37.bin (1.3 MB)
Hi Francisco,

Here is a log with LOG_DISARMED set to 1. This log shows one more issue I saw earlier only once - after the takeoff command (dronekit simple takeoff) the two motors gradually increase their rpm.