Stop Sync with Facebook

I recently switched from iPhoto to Aperture, and like it for the most part.

I am, however, having an issue thats making me think again about my decision.

I've created several Photo Libraries in Aperture and have posted some photos from one Library to my Facebook account. When I switch to another Aperture Library, the photos posted already in Facebook from the other Library get downloaded into the Library they weren't posted from.

I don't want them to sync into multiple Photo Libraries. Is there any way to get Aperture to NOT download my photos from Facebook besides not using Aperture at all to post into Facebook in the first place?

Thanks!