I hit the verify button after some fooling, and it eventually did do the full verification process. This oddly reset my settings, and when I tried to join a random game, I was able to play one game. After that, I went back and changed my video settings back, and WHAM, couldn't join any games again. I've gone back and tried deleting my settings manually. This allows me to attempt to join games (it finds them and connects to them), but instead of going to the game, it dumps me out after loading and says I lost connection to the host.
But then I start fuzzy bunny with the CloudEmulationSettings setting in the Cloud folder. Toying with that has given me bizarre success, though I'm not quite sure whether that is happenstance or whether I'm actually doing something. Either way, I played some deathmatch. Some guy took my prey, and I called a vendetta on him and murdered him repeatedly for the rest of the match. Got top score and killed him more times than anyone else. I'm sure he regretted pissing off the first-place guy.
Edited by Gamemako, October 27 2012 - 09:16 PM.