To tell you the truth, I really don't know what's going on.
Did you try to clear the Cache files after upgrade? ( I mean if you are using such plugins for caching the html files for faster processing. )
You might also want to completely uninstall & delete the Hana Flv Plugin and reinstall it again.
If the above doesn't solve the problem. You can add below code into your theme's header.php file, within
For FlowPlayer 3 (Player=4)