I got a strange one guys. I have a machine here that is having some sort of strange issue with the defpoints layer.
Our title block has a border around it for the "printable area" that is on the defpoints layer. One of my machines, when you x-ref that title block into a new drawing, the border shows up fine. But once you save and close, then reopen, the border is not showing up. The layer is clearly not frozen or anything like that, it just isn't displaying.