I was working on one of my projects and noticed that one item was out of place. When trying to delete it I got this message: "A serious error has occurred. It is strongly recommended that you use Save As to save your work in a new file before continuing." It then gives me the option to save a recovery or just continue without saving at all. The rest of the project seems to be running smoothly, I just can't delete that object or any other instance of that family in the entire project. This is normally where I would just scratch my head and reload a backup but unfortunately I didn't notice this was a problem until a few saves later so my backup even has this object in it. At the moment I am just hiding the object, but I would really like a solution on how to delete it. I have run an Audit as well but unfortunately that did not help.