Are there any new blueprints in the area you can't open? I never had the crash you describe, but the "out of bounds exceptions" always came from bad blueprints or bad 2da's. Didn't you try to work from an NWN blueprint for instance?
No I didn't use a NWN Blueprint. Everything seemed to be working normally, then I made one change to a model in a hakpack and everything went to pot. The model seemed to work fine in a new module, so I don't think it was that. I tried each of the areas and all but one will open. However, none of them will export, so I can't import them into a new module. I want to be able to get clean exports so that I can reload the module if I have another issue.
At this point I've pretty much resigned myself to rebuilding the areas and stores. I wasn't completely satisfied with some of the areas, so at least this will allow me to do them better.
Thanks for the suggestions everybody.
Ed.: I did find an earlier backup copy so I was able to recover three of the areas and some blueprints. 