I built a ceramics workbench and placed the module inside my ceramics workshop. When I entered the workshop menu it showed two ceramics workbenches instead of one. When I added a job to one of them my overseer would not do it. So I tried adding the job to the second workbench as well. He still refused to use the bench. Another oddity was if I adjusted the number of objects I wanted made it would jump by two instead of one, and it would add the number to both workbenches. I tried to dismantle it to see if that would fix my problem. It removed both workbenches from the menu but it did not remove the workbench from the actual workshop. So now I have a workbench with the "?" icon in my shop that is unusable. It also didn't give me the module back. Here is a screenshot: http://imgur.com/a/BfOfj I've also attached a save file (The save is before I tried to dismantle the workbench).