I just started playing with this last night, it'd be awesome if not for the hanging. It's definitely related to the leaderboard server; using
TCPView, I found that the program is only unresponsive while trying to contact 70.173.98.65:13002 (TCP). If I rightclick -> close connection, it starts responding again right away.. unfortunately, it's still pretty much unusable as the program tries to connect again every 30 seconds or so.