happend to me to.. I got no response at all for this and it sucks. Beacuse it happened TWO times. One at level 50 (Paladin)
And that was at 2.0 then when i exit the game i got "BAD INVENTORY DATA" the next i got my paladin ON (2.1.0) to level 79 and the same happened..
This is NOT my fault and i cant see why this is happening. BUT this has something with single player to do. I cant see anyone playing online having the same problem.
So if you play TSW i guess they get something on entering TSW as an update that single player doesnt get. This HAS to be a proiority for Devs!!!!