Aperture 3 and Flickr syncing back and forth

I posted some pics to flickr using Aperture 3, and later added keywords, again using Aperture 3. I couldn't get the new keywords to sync up to my flickr page, something I'd been able to do previously. I hit the broadcast sync button, but it is not adding the new keywords (tags) to Flickr. How is the best and easiest way to sync the keywords in Aperture 3 to Flickr and vise versa from Flickr to Aperture? I would like it to keep syncing continuously also.

Thanks