Hi,
Floatbox Plus dose not catch errors caused by the country-specific missing of a video from youtube.
If in the servers country the video is missed, Floatbox Plus stops with "Fatal error: Call to a member function attributes() on a non-object in /srv/www/htdocs/web157/html/wp-content/plugins/floatbox-plus/floatbox-plus.php on line 715".
This is an problem, if the video's state changes after posting the video. So the user gets an uncompleted page without ability to open the next page.

Thanks for the great plug in. I hope, I can help to improve it.