We are experiencing the same problem. Failure occurs just with one of our videos. It happens when we have finished upload the video to FV Player and then save the project, Happens when saved directly in FV Player but also when adding the clip from the back-end.

Warning: stripslashes() expects parameter 1 to be string, object given in ../wp-content/plugins/fv-wordpress-flowplayer/models/db-player-meta.php on line 341

Warning: Cannot modify header information – headers already sent by (output started at ../wp-content/plugins/fv-wordpress-flowplayer/models/db-player-meta.php:341) in ../wp-admin/post.php on line 231

Warning: Cannot modify header information – headers already sent by (output started at ../wp-content/plugins/fv-wordpress-flowplayer/models/db-player-meta.php:341) in ../wp-includes/pluggable.php on line 1281

Warning: Cannot modify header information – headers already sent by (output started at ../wp-content/plugins/fv-wordpress-flowplayer/models/db-player-meta.php:341) in ../wp-includes/pluggable.php on line 1284