I have a HitachiLG 47dj, flashed it myself, went to play back-up and got "Mixed Media Disc". The original, movies, and back-ups of dvd's play just fine. Burned back-up 5x with Lite-On DVDrw SHW-160p6s, using imgburn, nero, clone-cd using SonyDVD+R DLs. Don't know what I'm doing wrong. Any help would be appreciated.
And you are using the proper layer break, have you checked the image with XDVD Mulleter? To check whether or not it is ixtreme compatible.
Also make sure the game's region is the same as your console.
You can set the layer break manually (using Imgburn) by going into Tools ---> Settings ---> Write ---> Layer break (for DL media) Click user specified and type in 1913760.