Just tried to register but apparently their user account limit has been reached.
Are you saying that your *cough* bt isos work fine? I *cough* downloaded isos for Call of Duty 3 and Prince of Persia: Rival Swords, burnt them but they don't get recognised by the console. The iso file sizes are correct at 4,699,979,776 bytes. Maybe it's just coincidence that both won't play.