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.