Hi Scott,
Thanks for the reply. Did you mean the “detach box”? Turns out a vaulted ceiling on the other side of the room was the culprit. In my limited experience there appears to be no relationship whatsoever.
I do backups throughout the day so I went to my previous backup and found no problem. Then, I thought about what I did to the model since I last backed up. I thought, vaulted ceilings. So I went back to my current version and deleted vaulted ceilings one by one until I found the culprit. Closed without saving and reopened, deleted the culprit, made the change, mirror copied the adjacent vault, and was back on the road.
Thanks,
Sam