Crash on save

[bobatlast]

I've reached a point in the Chizra map where any attempt to save my game yields a general protection fault with a trace that begins with this:

History: FArchiveSaveTagExports<<Obj <- FPropertyTag::SerializeTaggedProperty <- SaveStream <- UStruct::SerializeTaggedProperties ...

Any attempt to save after this point, even after a map transition (which I reached by using 'god' to get through this map) causes the same error. Apparently, my game is permanently corrupted.

Anybody have any idea what's going on and/or how to get past this?

(And FWIW I've got the DEP exclusions set properly, so this isn't the same protection fault that can happen on launch.)