I think I'm experiencing the same issue. Couple months back I was able to burn my games with my Pioneer DVR-216D while using ImgBurn or CloneCD to burn the ISO's and everything worked beautifully, playing the games and all. But for the last couple of weeks, I cannot play any new games that I burn. The burn process goes great, no errors nothing. But as soon I pop it in the Xbox 360 and go play. It says play DVD then I get a the huge XBOX LOGO and just stays there. It appears its not reading the burned copy properly.
I've already upgraded my Pioneer DVR-216D firmware to 1.09 using DVRFlash. Burned another ISO and still didn't work.
I've then enabled the bitsetting while using MCSE then re-flashed again with DVRFlash, burned another ISO, tested, still didn't work. My last option was to apply the RCP1 patch on my firmware. I did apply the patch, re-flashed, burned and still no success.
I'm really running out of ideas here. I'm not sure if the problem is related with the burning process (PC related issue) or XBOX DVD-ROM related issue.
If someone could shine a little light on this it would be great!
Cheers!