Hi Ed,
Chkdsk on the USB did not find any errors.
I have taken these steps since:
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Deleted the SecureDiskv3.0 from the Cruzer, as it seemed this version was not doing anything when launched.
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Installed SecureDiskv2.0 on the Cruzer. Launched, set up password to match the old backup one.
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Tools > Restore > selected the backup data from my C:. It removed the old vault from the USB, and restored the backed-up files from my PC, onto the Cruzer.
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After completion, ejected Cruzer, re-inserted, opened app. It opens using the same password as previously (always) used.
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The App opens, but no files can be browsed, despite the backup data now existing in the Vault since the restore.
It seems there is no way I will be able to access the contents of the backup.