Possible memory stomp here. I had tagged a number of items as wares and sold them to the halfling trader in the grove. After doing the exchange, all the wares items I sold now had a random number in place of the image, and if you hovered your mouse over it the description box was empty.
I then left the conversation and started up a new trade and the images were back to normal.
However, after looting Aradin's trunk, I went to sell his gear to Authie Ethyl. These items were not marked as wares, however after I sold them they too showed the random numbers instead of images.