crash report @ pastebin link
Let me know if there's additional info I can provide. Using a custom profile if that helps.

It is most likely related to that. What's custom about it? What did you change?

oh... all sorts of stuff! :)
UDK cfg

Can you give a summary of the meaning of the changes? It is so that I can figure out why it is crashing. I guess you set some of the values too large/small causing it to overflow somewhere

I got this as well. Most of my changes were to explosions. I set them to 0.0 chance to appear and all their radius and other dimensions to 1. Somehow my cities also ended up being really small and not having any domes even though I am in the wasteland dome config. I might have to leave more of the settings alone. I'll do a new world with more vanilla settings (though I am removing the biomes from the very first list so the overworld generates normally) and report back.

my summary is that its a profile with tall buildings, chisel and quark worldgen with a slightly elevated sea level (for post-global warming feel). This crash also happens without the quarkgen but in both cases its sporadic. Seems very 50/50, but if i can get a world to load, i will see the crash when spawning new chunks eventually.

My cfg is posted above at link (was that clear? maybe not...)