Sharing to Flickr problem

If I choose to share a photo to Flickr and add it to an existing set, I do not see that photo displaying in my Aperture Album. I notice that the picture count increases with the new addition, but that picture is not displayed. 'Sychronizing' does not show the pic either.

When I open iPhoto, however, my Flickr photo set is a complete album and all photos are displayed properly.

What magic trick have a forgotten to do in Aperture?