This has occured on several of our files; as far as I can tell, at some point, all objects in the file (callouts, detail tags, section tags, etc.) turned into un-editable 'plug-in objects.'
The OIP shows them with no editable attributes, dimensions, etc. Unfortunately, there have been multiple people working on the set, so I can't determine a clear history in terms of what has been done to the files. Is there any kind of fix for this, or will we need to either explode all our annotation symbols/make new ones?
I'm reluctant to use callouts, etc. after this, on the chance that we'll end up with another set with uneditable notes right before a deadline.