I just fixed a problem after reviewing the support entries. Videos weren't playing in the lightbox.
The customer has a commercial license so the jwplayer logo should not appear. However it's now appearing over videos.
I found this support item: http://wordpress.org/support/topic/plugin-shadowbox-js-removing-jwplayer-attribution-after-buying-commercial-version?replies=3 . But it's out of date. I don't remember what I had to do to remove the logo previously.
What do you have to do with a commercial version of the player to prevent the jwplayer logo from showing on videos?