Hello Loizos,
Thank you for your message.
Could you please clarify which version of Remote Utilities was used before the updating and to which version you've updated to?
In addition, please try restoring your address book manually from a backup. Backup files are store in the following folder:
\%AppData%\Roaming\Remote Utilities Files\backups\For more information on how to restore the address book from a backup, please follow this step-by-step guide:
https://www.remoteutilities.com/support/docs/backing-up-address-books/#Restoring_an_address_book_from_a_backupPlease let us know if the problem persists after restoring the address book from a backup file.