Quote Originally Posted by OErjan
if the md5 checks out it could be that you burned it at a higher speed than 4x, it is a common problem with those burned at say 10x or higher.
another thing is that the media might be less than 100%
read this to find out how to check MD5
http://www.knoppix.net/wiki/Download...O_CD_images.3F
OErjan, thank you for your reply.

It certainly was burnt with the speed higher than 10x - it was 24x. I don't doubt image integrity, but I will try confirming the checksum and duplicating the disk burining it with a lower speed.