I have a Sony Vaio Duo 11 w/ Windows 8 Pro - it runs the same 1920x1080 as the Surface Pro that onxystardock is using. I have the display scaling set to 150% to make screen elements from showing up tiny at such a high resolution, but that is what causes Deskscapes 8 to show a tile of the Dream instead of full screen (it shows up in the upper left hand corner.

If I scale that magnification down to 100% the Dream looks fine and fills up the whole screen. The problem is then everything gets super tiny and unreadable.