On some flights I have found that the Standby Attitude Indicator could not be recaged. Left clicking on the knob wouldn't work anymore.
As strange as it seems, it appears to be caused by tilted taxiways. If the taxiway is level, no problem, but if I taxi on a tilted taxiway like we have on Nellis for example, then the issue pops up.
I repeated the test a handful of times with consistent results. I have attached a track below. F5 sai recage impossible.trk