It seems that the link between the metadata replaced in the bins, and that which is normally within the Media Tool (and possibly attached to the media itself) has been severed.

In the media tool, the custom 'Description' metadata is no longer visible, and though I have deleted database files among some other things, and renamed a few clips to no avail. I then checked a few things, and went to sift in the Media Tool for some footage. I went back to the last backup of the project, where the clip names were intact, and then imported only the sequence bin I had been working on into this backup project. When I reopened the MC, all of my custom metadata (save a handful of clips) was gone. This worked fine until the system crashed during normal operation with most of the bins open. In order to log the footage (around 55 hours), I had created a decent naming scheme, using a custom 'Description' column in a custom bin view for all the rushes which was then searchable in Media Tool to find selected shots for me/the producer/the director. The project media is spread across 6 x 1TB partitions and all media has been left with its original alphanumeric file names as requested by the editor.

The project is mostly native Nanoflash MXF files stripped into separate streams via the standard avid import dialogue, where it recognises them as XDCAM media and 'fast' imports. I have had a couple of days trying in vain to find a way of fixing a fault that occurred after MC (on a MBP 10.5) crashed whilst working as an assistant on a long-form doc.

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