All of the sudden my dvd drive wont recognize blank dual layer dvds. It will play movies that are dual layer and will recognize regualr dvds but when i put in a dual layer dvd even anydvd says there is no disc present in the drive. I use Memorex DVD+R DL. I have tried all 17 discs i have left and none of them are showing up in the drive. I use DVD shrink 3.2 AnyDVD and nero 6.