I have had maybe 10 out of approx 3000 files which have done this. A reload of the exact same file from my PC fixes the problem. All I can think of is some kind of corruption in the initial transfer. Sometimes the effects are amazing - a version of Cowboy by Kid Rock sounding like it's played through a kazoo:)
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock