I don't have a PS3 so don't know if this is possible or not but are you able to delete the browsing history and cache from the PS3 then try logging on gain. It may be that you have a "stale" page stored on the PS3.
EDIT: Found this link which might help
http://ccm.net/faq/33842-playstation-3-how-to-clear-your-browsing-data