Just be sure to stay off the “Lobbies” tab, and be careful whose maps/games you play. Stick to your familiar authors/maps.
EDIT: Unfortunately, after a custom game, the UI returns to the “Lobbies” tab automatically. So unless people completely close out of the game on the Victory/Defeat/Quit screen, they are going to get frozen.
EDIT 2: The issue in the above edit has a work around now too.