Yeah, I've been having the same problem with video player/movie player licennse being accepted in my Admin panel and registered in Unity but on the website the player keeps on returning the message "widget not registered". Am getting frustrated and disappointed with the lack of feedback. I've been talking about this here :

http://www.boonex.com/unity/forums/topic/Licences.htm

and also here :

http://www.boonex.com/unity/forums/topic/Dolphin-6-1-1-is-a-pile-of-junk.htm

and am see more still waiting for someone out there who has cracked it to come on and tell us about it. meanwhile my users at the website http://ecovoiceonline.org are screaming at me.