Not auto-tagging M4A based on file name/path

I've been playing around with trying to get some AAC/MP4 (m4a) files 
onto my iPod.  For MP3s, the "guess tags based on path" option seems to 
work well.  Nothing doing for an M4A file - it's just setting the title 
to be the file name, and leaving Album/Artist as "Unknown".

Any thoughts?


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