AH-HA! So it is a bug-thingy/oversight.
Just updated today. After trying a variety of discs in two separate poots I'm glad I decided to visit the forums. Well, it looks like you're sitting on it longer than 24hrs Lighting_UK. Nevermind, after frigging Nero trashed three costly Verbatum DL discs I moved to Imgburn and I never looked back. I constantly see Imgburn recommended as the burning application of choice everywhere I surf, and no wonder... thanks for all your hard work Lighting.