Esteban I replied to our email discussion with the hotfix.
James, as a followup it seems that Facebook has changed up their graph api once again for images so that it requires additional params and isn’t responding to the size params… I have setup a hotfix in the interim to work with the new request format and resolve the size limitation to pull the large size image on request https://gist.github.com/3974181 Please let me know if this resolves your issues as well.
Cheers,
Tim