NEC 3500ag won't write to DL

Hay Guys/Gals

I have an NEC 3500ag drive firmware 2.86 and latest aspi drivers etc… I can’t get it to write onto +R DL for the life of me. It recognises that there is a dL disc inserted but when it comes to write it spits it out.

I’ve tried using Nero, Clone DVD, Windows but nowt helps :confused:

Any thoughts ??