Game CTD before A3 Town

I've crashed to desktop over 30 times now trying to get close to the act 3 town portal in Sandswept Marsh. No error message, just instant crash. I've let my instance time out for 15 minutes 2 times now and cleared the zone again just to instantly crash again near the portal.

Crashed about 75 times now. Can't get within 2 screens of the portal before a CTD.

Same here, CTD when I try to re-login to Sandswept Marsh.