Can not delete deleted email

EM client v9.0.1708.0
All of a sudden I have several emails in the deleted folder that will not delete.
When opened they are blank.
I have tried a backup and restore. No Fix
I have tried the v9 reinstall fix option. Repair fails but gives no reason for the failure.
This is a POP-3 account with no viable backup.
Would a export Import be a possible fix?
Any other suggestions welcome.