We're having an issue that seems to be related to specific XREFs. When they are attached, a new collapsed window (see pic) appears and AutoCAD seems to hang, waiting for it to complete whatever it is doing. This window can't be closed, and if you end task it, it crashes AutoCAD. As long as it is open, you can't get the main AutoCAD application to respond. Any ideas on what might be opening this window, or what it is trying to do?