Youtube shopt code not working

I have upgraded to the newer version and even added `update_option(‘su_compatibility_mode_prefix’, ‘gn_’);

but the youtube code doesn’t work. I cant go and convert all the youtube codes i pasted as I have over a thousand and every video is showing up is your youtube video instead of the video i put in.
not cool at all.

How can i downgrade this. I am loosing readers now, and even getting hate mail.

http://wordpress.org/plugins/shortcodes-ultimate/