When an email contains an attachment that ScannerVision can't open but should be able to, that email is flagged(starred) and marked as Unread.
When an email contains an attachment that ScannerVision can open but it fails during processing, that email is flagged(starred) and marked as Read.
You are probably unflagging it with Outlook via Exchange Server Protocol. Unflag it using an email client that is set up to use IMAP protocol.
The flagging via IMAP and Exchange Server Protocol are not the same. Flagging via IMAP causes a flag to appear on the mail in the mailbox.
Unflagging via Exchange Server Protocol does not cause the flag to disappear on IMAP clients. Microsoft / (IMAP/Exchange Server Protocol flag translation) issue.
A Windows Feature Update has deleted the certificate used by ScannerVision to access the database where all Clients,
Users and Connections have been stored. Close ScannerVision, navigate to the
C:\ProgramData\ScannerVision\Config folder and delete the Settings.db and Settings.key files.
This will delete all Clients, Users and Connections which have been setup and these will need to be created again.
A backup of the database and certificate can be made using the Backup/Restore
Tool within ScannerVision, and this backup can be restored should this happen again. It is recommended to do regular backups of the database.