Aperture 3.5 no longer syncs to Flickr?!
This is really weird. I recently upgraded from OS X 10.8.5 to 10.9.2, and from Aperture 3.4.2 (whatever was most current under Mountain Lion) to Aperture 3.5.1. Today I tried dragging a photo from my Aperture library to the Flickr icon under "Shared," and the drag is possible, but the photo is not uploaded. I've tried resynching the entire account, and the sync arrows appear -- but nothing really happens. I don't see any of the usual sync threads in the Activity Monitor, either.
Any idea as to what could be wrong?
MacBook Pro with Retina display, OS X Mavericks (10.9.2)