If you're using FTM2012 and you need to sync, go to your Plan page on FTM and look at your Sync Now button. Is it greyed out?
The reason I ask is because mine is greyed out and disabled, even though I get the message "Sync needed". Also, my "Invite to Online Tree" button is greyed out and disabled.
I figured that this might just be a glitch in the software so I shut down and restarted, but it is still the same. This is weird.