When you bring up the server menu and click anywhere while the screen is still white (before the servers show up) the client would crash, not everytime.
Sometimes it randomly crashes when I try to make a server
Sometimes even if I name my server the most random thing, I would still be put in a room with people in it.
Sometimes the opponent's timer would suddenly go white and I can only see my half of the timer.
Sometimes when you set a mod it would be stubborn, and not set it no matter what you do - I found a way around this by setting another mod and then back to the mod that I wanted at first.
Wouldn't let me connect to other servers sometimes, no - they are not password protected.