Parameters for setting up the mail server used to send Notifications have been updated, notably to support unsecured mail servers.
Since 3.4.1, it could happen that the finalize review screen would fail to display the discussion and findings for the selected resource.
The list of known issues can be found on the known issues page.
There is no specific action to take upon migrating from version 3.x.x. Simply follow the Updating SECollab guidelines.