Just had a crash in the SP campaign. Game froze and crashed and took firefox with it. This also happened in MP earlier with the same result when I joined a server after alt-tabbing (the test server).
Specs:
Windows 7 Home Premium
6GB RAM
Nvidia GTX 570
You're crashes are related to hardware physics. Can you update your graphics drivers to the latest (if they're not up to date) and check if that helps?
We are adding an automatic crash reporting tool to the next version of the game. You can find details here: [url]http://forums.tripwireinteractive.com/showthread.php?t=75253[/URL]