I tried getting on to a multiplayer game on the H3 playlist and I got kicked out after waiting on the loading screen. I switched to the team slayer playlist and was able to play on H2 maps that were selected but when a H3 map was selected in that playlist I got kicked out. Very frustrating.
Update: I tried selecting a H3 map in a custom game and MCC hangs on the map loading screen. I can load a H4, H2 and H1 maps without issue.