Traders don't load

Traders do not load. Therapist and Ragman load but no other traders load. They spin in an infinite loop and the logs suggest its a stack overflow error. Please fix.

16GB of RAM, paging file is 4.5GB. I have a couple hundred hours in the vanilla game and never ran into this issue for what it's worth.

Any updates? The SP mod is literally useless if I can't level traders.

Thanks for the response. I will try a fresh install and see if that makes a difference.

In case this info is of any use, all traders were functioning properly until I reached level 5 or so and not only does the trader inventory not load but my stash doesn't either except for Therapist and Ragman.

I have attached an image of the RAM usage in the current install.