[Avid-L2] Database issue Symphony Nitris

While attempting to open the Media Tool, my Avid Symphony Nitris stops and show the following error message.
Exception: 'CM_NO_TRACKS_FOUND' An error occurred loading database. G;\Avid MediaFiles\MXF\4. If I OK the error message, it sometimes does reveal the Media Tool, nut clearly not all of the clips I know are in there.

And yes, before you aks, I have already tried trashing the msmFMID and msmMMOB files and rebuilding them during a software re-launch.

I guess I might have a corrupted media file, but how would I find it?

Thanks for any ideas.
Gary

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