[Only streaming youtube not working]

I have a problem, which is there on both Firestorm and the SL viewer, that streaming (live) youtube does not work (shows a grey screen saying media not supported and a help link about html 5), but non-live youtube links work fine.   Both types of streams worked well for me in SL right up to a few days ago where i updated both firestorm and the SL viewer.   My guess is that it's some sort of plug in problem but does live youtube somehow use a different media type or diff SL plugin than non-live?

I reinstalled everything trying to fix it but haven't been successful.