Found this on
http://www.rustafied.com: Some players are experiencing client crashes every time they join a server. One potential culprit is the change from yesterday which has PVT turned on by default. Although PVT does provide an FPS boost for many, it appears to be unstable on certain systems. To turn it off when you?re in the main menu, simply pull up console (F1) and type: terrain.pvt false.