Exporting to Facebook from Aperture broke for me around the Aperture 3.3.2 patch. I've had Facebook use (and not use) Login Approvals, and it still fails. It has never worked; some people seem to have found it started to work .... Perhaps someone from Apple could investigate? Is there proper (pay for) support available for Aperture?
This is also a problem for me - often happens after my Mac has been to sleep. I think the number of alerts is the same as the number of Facebook albums I have published. Will give it a try turning of the setting to look for new photos in albums. In general though, Facebook integration has been really unreliable since v3.3.
Same problem here, I see it happening after waking up from Stop. Instead or forcing Aperture to close I found that by alternating rapidly pressing Enter and Cmd-Q I manage to shut down Aperture properly, but sometimes it shuts down with an error after updating , of which I have a capture if someone knows how to make sense of it I can post it. When I restart Facebook and Flicker work correctly, so I think it is linked with trying to access FB when sleeping or something similar.
Someone above complains about the price of a few tens of euros or dollars he spent, I paid a couple hundreds... gues how I am ****** off...