ImgBurn reports what it was told by the burner. The 'No Seek Complete' error means the drive couldn't read the burned disc, and the 'Session Fixation' error means the burner couldn't even finish the burn. Those problems are likely to be caused by low quality media, especially when using dual-layer discs, so please read this: http://forum.imgburn.com/index.php?showtopic=8000