audio track 1 'offline' on Avid
 

I just finished loading a large shoot to Avid Adrenaline from P2 media. All 4 audio tracks are there for each shot, in the mxf files. But on the Avid timeline, Audio 1 appears offline for every clip. Is anyone familiar with this problem, its cause and any workaround?

(All of the video & audio clips from P2 were copied to the Avid's mxf mediafiles folder, then pulled into a bin through the media tool, as documented elsewhere. Everything worked fine, except audio track 1. This is true for all 8 16GB loads copied to the Adrenaline. Material was shot in DVCPro50.)

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Edit added later:
For those who have this pop up (for a still-unknown reason), I forced the drives to rescan and reload the media database. That brought track one back online.