We have noticed linked models mysteriously vanishing recently. Our set up is that we have a linked model that is in it's own Workset, so we can control the loading of the Workset when we open the model. We have seen recently that the link shows a loaded in Manage Links and its Workset is Open, but the link is shown as being Unloaded in the Project Browser and is not visible on the screen. If the link is reloaded from the Project Browser than the link shows up as loaded in the Project Browser and is visible on the screen. Has anyone else seen this phenomenon?