To refresh the connection between dotloop and Loft, start by clicking on Connect Dotloop
Click the Account Settings
You will be prompted to login to dotloop, will land on the Partner Apps page where you can click Remove App
Head back to the Integrations > Dotloop Loops menu and click Connect Dotloop to reauthorize the connection.
Ensure the company profile is selected
This should resolve any permission or connection issues.
Loops attached to deals that are closed will not show the Sync Deal option.
Only deals that are NOT closed allow Re-syncing.
The reason this may happen is detailed in this article: http://help.loft47.com/en/articles/3341662-dotloop-connection-trouble-shooting-when-one-dotloop-account-is-shared-with-multiple-loft-users