Just a quick update, for anyone receiving the log message: "I do not own this mesh...". I was able to work around the content issue with a code fix. In the next release (1.6.2, which should be out next week), you should be able to simply remove the content pack from your figure that was causing a problem, then right click the ".mon" file next to the prefab/fbx of the content causing issues (or just reimport the entire outfit if you don't mind the textures being reimported) and it should fix your problem. Then you can re-attach the content pack. I'll post here when 1.6.2 ships.