The game client hard freezes/crashes (deadlock) when trying to enter some instances with around 20 players. I am unsure if it is due to the number of players in the instance, but joining an empty instance of the same world works fine. The freeze/crash seems to happen near the end of the world loading, and then Windows detects the application as not responding anymore. Going back to the public release branch (1554) and I can join the instance just fine, it is only an issue with the Open Beta branch (1564). I doubt it is an avatar in the instance, since the client freezes before the world finishes loading. I also doubt it is the world itself, since loading into the world when it is empty is no issue, and I have had the issue with multiple different worlds. The only common thing I see in the logfile that makes me suspicious, is the two "Holding recovery payload until all bunches are received." messages, since it could sound like cause for a deadlock.