Hello,
I recently setup a Facebook connection in Lightroom 4, and everything Authorized properly, however, when I go to publish a photo, any photo, I get an error back stating "Photo Upload Failed" and when I click OK, a second box pops up saying "Cannot Update this Collection". The strange part is 50% of the time the photos actually do upload to Facebook, but they are never marked as such in Lightroom, so every time I publish it tried to reupload the photos. What am I doing wrong here? Elements seems to work fine, and Lightroom 3.6 worked fine from this same PC. I did a fresh install of Lightroom 4, built a new Catalog, still the same problem.