My latest report:
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16.0.71 (4/18/2011)1. Fixed: 6 and 8 channel AAC files would not play correctly.
confirmed fixed2. Fixed: MP4 Action Window > Tag > Format page showed "bit" instead of "kbps" for the bitrate unit.
confirmed fixed3. Fixed: Headerless AAC files were not playing properly.
not yet tested16.0.72 (4/19/2011)1. NEW: MP4 plugin supports AAC radio / streaming using the buffering reading system used by MP3.
not yet tested2. NEW: MP4 plugin supports Icy metadata when playing AAC radio so track names, artists, etc. appear.
not yet tested16.0.73 (4/20/2011)2. NEW: AAC audio decoder outputs 64-bit (previously output 16-bit).
not yet tested4. Fixed: m4a audio file tagger did not embed image in file.
confirmed fixed,
a new bug: it is impossible to remove embedded cover art. "Cover Art > Remove Cover Art" does not remove the image from the file.5. Fixed: m4a audio file tagger did not preserve existing "total number of tracks" and "total number of disks" values when writing "track #" and "disk #" respectively.
confirmed fixed,
a new bug: it is impossible to clear the track or disc number from the file. When a track or disc number is deleted the change is applied only to the database. (If the file tag contains the "total part" it should be removed too.)6. Changed: m4a audio file tagger will not replace existing encoding tool tag ('İtoo' atom) with "Media Center 16.0.xx". Instead, "Tool Name" and "Tool Version" are written in different atoms.
confirmed fixed7. Fixed: Some AAC radio / streaming sites were not working.
not yet tested10. Fixed: m4a audio file tagger did not handle Date field correctly.
confirmed fixed_______________________________________________________
Possibly a new bug: My 24-bit high resolution QuickTime/qaac encoded ALAC sample files do not decode correctly (they produce only loud noise). My 24-bit ALAC samples that were encoded with dBpoweramp's ALAC encoder play correctly.
The header info may be wrong in the 24-bit QuickTime/qaac ALAC samples. Some tools report "16-bit". Despite this foobar2000 can play the files correctly.
The samples are available here:
http://cid-138ca589c542aeee.office.live.com/self.aspx/MC%20stuff/m4a%20samples/ALACsamples.zip (It is a "skydrive" webpage and the actual download link is there.)