Why did MPAA rating not get saved?
Note the sidecar files include this set of fields:
<ParentalRating Adult="False">
<Value/>
<Description/>
</ParentalRating>
I don't know whether this all pertains to MPAA, or if MC is trying to make one set of fields do double duty. In any case, <Description> is for
MPAA Rating Description. I'm not sure what <Value> is for—but
MPAA Rating is
not stored there. If Adult="True",
MPAA Rating is overwritten with "Adult." I'm unaware of any way to set such a flag in MC currently. Maybe this is part of a parental control feature yet to come.
So it would seem if you want the MPAA rating saved to the sidecar, you have to use
MPAA Rating Description instead of
MPAA Rating. However, the Info Panel currently displays
MPAA Rating. So maybe the answer is to import the data to both these fields. Unless, of course, this is a bug or oversight that needs to be fixed.