Lock/Unlock out of sync?
 

New to OmniGraffle, but had this situation. After selecting an object, could not edit it. For all intents and purposes, the object looked locked, but I could select it. The The lock icon in the toolbar was in the "open" position. Somehow, after an hour or so trying to troubleShoot, clicked the lock icon, which now showed it was "closed", but now the object was fully editable. On closer inspection, all objects that are editable are shown as "locked" whereas any object not editable is shown as unlocked/open.
Anyone else seen this.
Using the latest version.