Edit: Didn’t realize I was going to post this minutes before the 0.1.0.8 update! Seems I can sell items again!
So I bought a bunch of bookshelves for a project I decided I don’t want to work on anymore, and after selling about 40 or so, I can’t sell anymore. Checked to see if Steam was down, it’s not, tried restarting my game, that didn’t work. Also tried moving them to different slots in my inventory, still nothing, and changing locations and trying still resulted in a failure.