Latest GTX 260 drivers. Both machines on LAN have one. I'm getting a ton of crashes, similar to the multiplayer sync bugs back in 2008, that was supposedly fixed. Specifically, I get a crash exactly 88 minutes into every LAN game. From then on, the crashes are random and much more frequent. There is occasionally a minidump that is 0KB, but other than that, nothing. Ironclad wants more info, but I've already submitted my dxdiag, and it happens all the time, no matter what game.
This is my favorite game ever, but it's getting hard to deal with. The first crashes are dead consistent (sometimes one machine, sometimes the other), and yet our machines are top notch, i7 920's at 4Ghz, etc.