For some reason, one of our Profile Views has turned into an ACAD_PROXY_OBJECT and all of the profile pipes have disappeared. The profiles turned into polylines and some of the vertical curve linework (tangents) changed to simple lines. Any copies of this Profile Grid have changed as well. Any idea why this would happen? I thought it might be something simple like the user Exploded the Profile Grid but that just turns everything into a Block and not an ACAD_PROXY_OBJECT.
We retrieved an earlier file so we're back up and running but I'd like to know what happened so it can possibly be prevented in the future.
Thanks in advance for any advice