Not all COM-ports are available in QGC 4.4.x

[maxfinbow]

Tested connecting PC via usb to ardupilot flight controller on windows version of QGC and the exact same behaviour occured as detailed in #11500
#11500

which was supposedly fixed by #11731 , however, the fix does not seem to be present in current QGC builds (tested on 4.4.0 and 4.4.2)

[HTRamsey]

It's fixed in the daily build and probably won't be back ported to the old stable builds