Garmin Express Syncing

I am using the latest version of Garmin Express and am using a Montana 750i.  When I connect my device, it keeps saying "Updates Available" but there is nothing to update.  It is already updated.  Then when I go to update, all I get is an annoying line that moves left and right and left and right as it "keeps syncing" but it just keeps doing that forever and nothing is getting done.  What is this all about and is my Garmin really updated?  Thank you in advance.  Any help appreciated.