As i recently upgraded my Setup, i noticed that UnleashX uses the first found HDTV mode in the available HDTV mode list (you enable/disable though MS dash) instead of the highest.
For instance, enabling 480p AND 720p results in 480p instead of 720p within UnleashX.
I would like to remind you that, if a Game supports only 480p, and that you enabled 720p only, it will run in 480i instead of 720p (since the Game doesnt support that mode); Although it could run in 480p....
So disabling 480p is not the way to go about this (which is how it currently works to my understanding).
I would be pleased to see this fixed.