Sudden Key Violation

Suddenly my users are getting key violations when adding what should be
a unique record to a table.  Edited table in paradox to ensure unique
record and got same thing.  Used TUtil & Paradox table repair to rebuild
it & still no good.
Removed all indexes (except primary on Autoinc field) just to give
myself a stupid check and still get the key violation.

Is there any type of table damage not picked up by TUtil that could
cause this?

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