I have the most current version of the Carbonite addon.
But, both I and my girlfriend have this issue from time to time where the "to complete quest click the ?" appears. It says in the quest watch list to click the ? but there is no interactivity with the red link listed. The only way I have found around it is to disable the carbonite addon and reload the interface, click the ? then reload the carbonite addon... just thought you should be aware.