I had exactly the same problem as Andy M. I fixed it (after a bit of swearing since I was just about to drive home from work) by pressing the right key very quickly while booting to skip to the next track. I went back to the "dud" track and it played fine (as it always did).

I didn't think to look at the load averages though.

Has only happened once so far.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)