I'm having the same problem with all my aircraft and all liveries. I can't change liveries within MSFS. The livery change is not working in [PROFILE][MY HANGAR][LIVERIES] nor when I go FLY.
However, if I change aircraft/livery within MSFS (livery do not change) and then restart MSFS the aircrafts appear in the livery choose before restarting MSFS.
This might be a clue.
PS
Otherwise I think the update is great.