To protect some racks in my model, I used multi-select, and then clicked "Toggle protect object" and "toggle no select" on Edit Selected Objects window.
Now I need to edit them, so I found one in the tree and double clicked on it to bring up its Properties, and unchecked "Protected" and "No select" on the General tab. It didn't work, and when I re-opened the properties window they were checked again.
Thinking that maybe I need to do it directly on the tree, I expanded the rack on the tree but couldn't find the node for either.
How do I allow selection and unprotect them again?