If that helps: I tried my macbook's internal soundcard, the Audio4, The Otus built-in soundcard and an M-Audio Transit. I also tried it with timecode, Midi-commands and mouse-only for transport and fiddling with the soundcard buffers. It all boils down to one thing: It doesn't have anything to do with soundcard drivers or anything else that is hardware related. It just happens with quite a few, but not all m4a files (and a few mp3s for that matter).
I read somewhere (NI forum maybe, can't find it again) that this problem is related to a new cache scheme that was introduced with version 1.2. Don't know how much truth is in that but it kind of makes sense.
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