I bought Postal 2 today since it was on sale. I installed it, and when I ran it, it started in 800x600 disabling my second monitor in the process - when I tried to change the resolution, it froze up, and I couldn't free my Keyboard or Mouse - no alt-tab, or anything. I was able to switch to another VT where I killed the process w/ htop, but when I switched back to my desktop I was still only on one monitor, and 800x600 - rebooted, still 800x600. I had to go into nvidia-settings and reconfigure my displays.
I haven't tried to launch it again, but was wondering if anyone else owns this title and had any/similar problems.
I'm running Kubuntu 13.04 with nvidia-313 on a i7-3770/GTX560Ti