This patch fixes a possible lock-up that could occur if a lot of events were issued at the same time (like when a match starts or on joining).
I've also set the default V-sync value to off again. The toggle remains (and I personally get the smoothest experience with it on), but V-sync behaves strangely on some machines. The game will target 120fps by default now, so it's not going to overheat your machine to leave it off.