I've run into some trouble making my mod. One of my NPCs needs to be a fence; he's got the Fences faction at rank 0 and the Thieves Guild faction at rank 2, but he won't buy my stolen goods. I tried comparing him to Ongar the World-Weary in the editor to see if maybe I missed something, but as far as I can see I've got all the important stuff. Any help would be much appreciated, thanks.

Did you set his Class to MerchFence?

Yes I did.

Will he buy some goods, just not stolen goods? Set his Responsibility to 30 or lower.
Will he not buy any goods at all? Check his AI packages.

I set his Responsibility to 25 and he now buys stolen goods. Thanks for your help, I really appreciate it!