Do you have MPE on on export? I'd try turning it off.
And the bunch of other troubleshooting tips to follow this post.
Yes F4V Huntrex that's my case http://forums.adobe.com/message/3215637#3215637
Exactly my problem and apparently I am far from alone.
Adobe, have you looked and found a solution for this?
Our engineers have identified the problem and are working on a fix. We don't yet have any news on when such a fix would be released.