Stewart, first of all, thanks for posting here and allowing us to help you.
Would you mind giving me some more details.
For example, how many updates in a 10 minute period are not showing up in Facebook on Yoono compared to Facebook.com?
Is it just status updates or is it comments, messages and invites?
Also, is this a new installation of Yoono or are you an upgrade from version 6?
Before you do testing, please head got Yoono.com and download the latest version so we're sure you are up to date.