After the last hotfix I get stuck in the matchmaking. After a game, I would try to exit, and the menu “would you like to quit matchmaking” would appear, I press OK (many times!), and nothing happens. On other occasions, after a game I would get back to the “deploying” screen of that game that just finished, and it’s impossible to do anything at that point – no menus, nothing.
The only way to exit this limbo I found is to quit and restart Halo.
This is mildly infuriating.