yeah I thought about reducing speed, but I had no problems so far, but I think I will limit it now to max 12 or 16
one day later all were problems were gone! I don't know, what it was, but now all burned dvd are working fine, even the ones, which reported CRC errors during install. I tried everything: reboot, different harddrives, different dvd drives, checking cables... but nothing worked before
crazy shit?!
sry about "major bug" in topic, imgburn is awesome