backups wont work anymore?

help please...i cant get backups working anymore.
have xbox360 with samsung drive flashed with ixtreme firmware.
dont know the version as it was done for me (Nov 08)
at first could burn games no problem but now they wont boot.
just get xbox360 screen (when i press controller get buttons at bottom of screen as if trying to play movie)
burning game with img (layer break set correct)on verbatim disks.
could i need to hav newer version of ixtreme firmware? or have the newer games changed?

any help greatly appreciated.thanks.