I have a Samsung HT-TQ85 home theater system and it HATES mostly all backup dvds. It’ll play my DL dvd backups fine but any dvd-5 discs I make says “Disc prohibited”, but there’s a workaround! If I burn a copy of that copy, it plays. I’m wondering if it’s some kind of rebuilding problem and if there’s some sort of iso rebuilding software that would fix this.
What programs are you using for creating your image file and burning? If you can provide your latest burn log, it may give some insight as to what the problem may be.