Hi John, could you please try to re-sign-in via the Creative Cloud app. So quit Lr Desktop, re-sign-in via the CC-app preferences and restart Lr Desktop afterwards. Then double check that the sync process is not paused at the to left activity center. If that won't help, just send me a LR Desktop diagnostig log - best as a private message with a downloadable dropbox link. You can trigger the log via LR Desktop preferences -> Lightroom Mobile and when you hold down the alt key you will notice a generate diagnostic log button - Guido
... View more