I know for sure that the batch is ok since i have burned over 100 dvds of the same batch. (i'm in the middle of a 25-pack spider also).
Only thing changed is that i installed a clean install of Windows 7 Ultimate x64 (Win 7 beta x64 prior to that).
Same media, same hardware and same firmware. Only that now it coasters.
Actually i burned a few coasters and then rebooted Windows.
After reboot one disc burned fine, and tried another with failure.
After that i installed all the newest chipset drivers and SATA drivers i could find, both trough Asus webpage and Intels.
Same result.
Sounds weird that i would have to clean the lens, but i'll buy a cleaning kit to try.
Is there any driver och software i could have missed?
Edit: Oh and i also tried different speed of burning. 8x 12x and 16x. Same result.