This might help
In firefox, type: "about:config" in the address bar
then, type in "ipv6" in the top filter bar
if the value = "false", right click and select "toggle".
the value now should change from "false" to "true".
( Puromycin will be wearing his "special" underpants on, Wed 1 Jul 2009, 12:29, archived)

Thanks for the suggestion but no luck with it.
Must be an ISP issue.
( Prequal ARRIBA SUPERIEUR PREMIUM COCAO 81%, Wed 1 Jul 2009, 12:36, archived)

Unless the name of the preference is "disableIPV6" ?
In which case false is probably good. Then again, why have an option to disable it unless it makes stuff work sometimes.
(_Felix suspicious character from prehistoric caucasus, Wed 1 Jul 2009, 12:36, archived)

Who knows? :)
Anyway, doesn't work either way. Besides I tried it on Chrome and IE8 with the same result so its not a Firefox issue.

Thanks again for the suggestions.
( Prequal ARRIBA SUPERIEUR PREMIUM COCAO 81%, Wed 1 Jul 2009, 12:40, archived)