Game crashes after jump through portal in Xen lab

The game crashes when I jump through the portal in the Xen lab. The screen turns white, the game plays the sound effects associated with the portal, the loading screen comes up and the then the game crashes to the desktop.

Update. The game will not allow Gonarch’s lair to load at all. Tried to start a new game and start on that level, but will not start, immediately crashes. Interloper will start normally though.