Hi there, i was having the same problems you had I fixed them by deleting all the files in the

/cache
/temp

Of the main Torment folder or make a backup first.

If that does not work, i read online that you can try re installing the widescreen mod to a lower resolution, but my problems were fixed by the first step.

Or, you can prevent any NPC's walking in the lower right corner of the area - that's when it crashes. Block their path with your own dudes and walk around from the other side if you want to take look what's in the back. Afaik there's really nothing to do there, except to look at some art.