The subject says it all.
Recently we stopped using VP6 to stream Flash, and are now using H.264, as recommended by the Wowza support team.
IE9 users on Win XP/7 AND users on the Vista OS (sigh...I know, Vista???) just get a blank screen instead of video.
I am planning to upgrade soon, but still have live events that need support.
Is there any kind of workaround or separate video code I need to implement?