I would figure out what kind of DVD you're making? Is it a straight play DVD or a DVD -VIDEO Disc with a menu?
If you just want the DVD to loop and start playing when you first pop it in the player, then set the end jump to continue playing the track you've selected as your First Play. That would be the best way to do it.
If you want the menu to loop make sure the menu is your first play and have it loop.