Dual Monitor Display problems

have a Geforce Ti4400 I recently upgraded the rest of my computer and updated all the drivers and downloaded all the service patchs.

Prior to this, I used to watch movies on my TV using the dual monitor setup on my card. Move Mediaplayer to the TV screen and then double click, and full screen. Now when I do that the full screen appears on my monitor instead of my TV screen. As you can imagine this is very frustrating.

I did manage to get it working by making the TV the primary monitor, but then when you try to play the video the movie part of the screen stays black while the sounds plays.

Any help anyone can offer would greatly be appreciated.

Thanks

Stonewall