When I try to export my project out to a saved file, one of my tracks (a "Real" instrument track / GB-included loop sample), for some reason that specific track/loop is muted for the two measures or so, before it comes in. The rest of the tracks come out fine, and the project plays correctly in Garageband. Anyone have any idea why that particular track wouldn't come in at the beginning? I notice this problem also shows up in the mix preview (that you can hear in QuickLook). There are only 4 tracks in this, it lasts about 4 seconds or less, though I am using a decent number of effects (probably 4 or 5 per track). I'm on a new iMac, so I doubt it's the processing power.