Looking at open.mapquest.com I see the TIFF overlays at all zoom levels but after implementing mapquest-us.xml they are not used above zoom 2 and all land is yellow, without any relief (green shaded). Here is a screen shot showing the page with some zoom level 2 and some zoom level 3 tiles - you can easily spot the difference.
Any ideas as to what I could have done wrong here? Thanks!
