I'm not quite sure what might have caused this in the 1.0.6 update, only a few minor things were added. I will look into why you might not be able to place some things that you mentioned, perhaps the forbidden deplorables contained a bed in your config? If you are able to send me your config it might help.
As for the foundation disappearing - I'm not sure on that one, I don't think the plugin has any logic that would have it destroy one of the foundations. That being said, I highly recommend download the BasementsManager extension plugin (its on the plugin page at the bottom). It lets you as an admin manage all the basements and potentially identity issues with them. I may see if I can add a button that can "fix" basements that somehow get errored like this.