Strange Mac Crash Error

Hey all,
So I recently claimed the humble bundle code for dungeon defenders on steam for my mac. For awhile, the game ran perfectly, no errors for about 6 hours. Usually it might get stuck on the start up screen for about 10 seconds, and then move on and continue as normal. I then went to change my graphics setting a bit, and then launched the game, when suddenly I got a crash during the launching video/movies/splash. I tried verifying my cache files, restarting my computer, and uninstalling and installing the game again. Anyone have a fix?

Crash Log:
https://gist.github.com/azianlegacy/91fb5fce26a5c014d604

System Specs:
Mac OSX 10.7.5
2.3 GHz Intel Core i7
4GB 1600 MHz DD3
NVIDIA GeForce GT 650M

Sorry to say, but I have a similar issues,I also used humble bundle code for dungeon defenders, I can safely run about 3 & half hours, then I will crash also having to reopen steam and DD, I have started limiting my games down to 3 or 4 matches or 2 NMHCPS before restarting to avoid crashing in game....but as far as a fix, I have not found one yet, I have checked online and more than us are having this same issues


System Specs:
Mac OSX 10.8.4
2.7 GHz Intel Core i5
16 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6770M 512 MB