Updated to 3.0.7.
Still having the same problem. Crew bus arrives. Crew then starts to walk in from somewhere out in the airfield. 8 of them as far as could see. They enter the airplane, and then nothing more happens.
Menu is hanging on "Boarding Crew now". After restarting coatl, and requesting boarding once more it starts with boarding passengers, and everything works fine it seems.
I noticed GSX is now closing the cargo doors, but after waiting for a while I had to close the passenger doors by myself. Didn't get a chance to see if GSX opened the doors, as I did that by myself via the EFB as I usually do.
Didn't see any seated passengers though.