About 11:00 am Pacific I started having a lot of problems with Shogun 2 freezing in the game lobby whenever I pulled up Steam chat (for example to reply to a request for the password to the game I was hosting). Every time I hit SHIFT-TAB to enter steamchat, S2 would freeze. I restarted my computer and S2 several times but still had the same problem. Eventually I asked everyone to stop using steam to communicate and we were able to get a game off the ground. Toward the end of the game when the result was clear and we had all said "gg" I went back into steamchat and it worked just fine. Then after the game was over and we were headed back to the results screen, I was still in steamchat and as soon as the cherry-blossom loading screen came up, Steam and Shogun 2 both froze, again.

It seems there was a recent Steam update that is causing problems. I'll post over at the .com and see if they can nail down the problem.