ive had the same problem a while ago. i nlited & created an ISO using nlite 1.0rc8. i wasted 2 CR-R's , 2 DVD-R's & used 1 CD-RW,, all failed with burning speed as 48x , 8x & 4 x non of them booted, but their booting in Virtual machine granting i used the image in the HDD. i had no choice but to create another build & that solved the prob. i suspect it has somthing to do with the latst RC