Updates to Definitions/Notes Not persisting in the model

In one particular model, when I use the UI or a macro to update the definition property of an entity in either Logical or Physical, I don't get any error. It just doesn't save it.  When I reopen the entity the updated definition isn't there.  I tried another diagram and it was fine.  Not sure what is causing this in this model.

8/18:  I resolved this.  It was specific to a single model so I rebuilt it from a backup.  Something got corrupted.  Not sure what or why but it is resolved.