Just back from testing 3.5-rc4 on my Tarot 680pro hexa and there does appear to be issues with PosHold. Copter drifts almost instantly when PosHold selected. Drifting left at about 1m/s in my case. As soon as I selected Loiter, the position held perfectly. Selected PosHold again and off it went again with the leftward drift. I can bring it back with some right roll stick if course, but as soon as stick centered, off it goes again on its drift. Altitude appears to be fine (using baro). You guys suggest I should start a new topic on this issue? I can get logs off the SD card as soon as I get back home.
Just raised a new topic with log here: Drifting to left in PosHold on Hexa 3.5-rc4