The Nvidia 191.xx drivers have a serious bug with that causes vsprintf statements to immediately crash the game. We have a workaround, and will be releasing a patch within a couple of days. As a bonus, we will include the new dm-zion, as well as possibly some other goodies!
Thanks to everyone who reported the bug, and thanks to Kirk Barnes for finding the fix!
This should be coming out in a few days. We've also disabled the automatic video settings detection on first run, as this was also causing problems for people, so the game will be defaulted to medium settings across the board.