I had some problems with the orbiter and size. After some hours searching web and local config-files, i tried changing to UI1, then back up to UI2. That did the trick. Think i tried "Full Regen." of Orbiter first also, but not sure. Anyway, try full regen. first. Will save u some time if it works :-)
I myself now have some trouble getting xine to play with correct aspect ratio. DVD movies getting played in 4:3. And some of my Xvid movies looks like they are played tilted and stretched?!. Most of the other xvid/divx movies work, even plays in 16:9.
Maybe some config. script that should be run to setup xine, as i didn't use AVWizard_Run.sh.
Let me hear from you if you also get this problem...