One of my co-workers is seeing a strange behavior that I can not figure out. We are starting to use tabs and slots to locate some of our components. The practice has been to create the tabs in the piece parts and then create one assembly cut in the top level assembly to make sure the slots are all in the proper location. In the current assembly when he closes the the sketch the slots move away from the tabs. And apparently not consistently either. The slots are dimensioned from the tab edges creating external references so one would think they would stay where the tabs are.
Unfortunately we are on 2017 yet and I don't know how soon we will be going to 2018.