Have you tried a system rollback to make sure that it works with the old drivers ? If it does, then the answer is obvious. If not, then the answer is not in the drivers.

I don't know if the situation is the same with nVidia, but Ati will not let you change any settings related to the tv-out if it does not detect that you have a tv connected. From the pictures you have posted, that would appear to be the situation here.