Frank,
As I mentioned earlier, if you're seeing inconsistent behavior it should be investigated by PTC via a techincal support case, and the functionality regarding update should be the same across the board (i.e. only update objects marked as out-of-date). I tried looking up your past cases, but didn't see any in the list that looked to be related to update functionality. Do you recall case number(s) for this? Were reasons provided for the behavior you were seeing?