I use custard and dashboard too and made the same experiences with the exchange and some other sides. A lot of sims and houses are corrupt and I have the same errors when trying to upload something even though I checked my whole cc and the library with the dashboard tool or custard and nothing seems to be corrupt unless I try to export it. I removed my complete CC and started the game without, exported a new sim, checked her and she was corrupt!!!! It's hard but I think I have to clean my sim bin and library as you did. I'm not sure if I save my sims back, will they be faulty again? I'll give it a try and thanks for your message.