Not sure if it is just me, however, when I loaded up a save after updating to the new version the Slaver's Guild seems broken. All of the functions seem to be working normally except for trying to sell off Slaves. None of them appear in the list, the only entry there is for selling away is a slave named Maria and I can't sell or select her either.
Viewing post in Aric's Expansion Rebred
I'm having the same issue - I tried selling slaves via Sebastian and in Umbra with the same result... it seems to have something to do with the Breeder Specialization Support section of outside.gd but I can't figure out exactly what. The script error in the attached image comes up when I try to sell slaves.