[quote... it sleep in the background !!!Even though you can't see it, the new library part of the GUI is constantly checking if anything has changed.

When burning DVDs etc. its always been a good idea to shutdown anything you're not using.
You might want to review everything else that's running in the background to be sure you do need it.

Have you tried adjusting any of the driver settings ?
Specifically, set "Theaded Optimization" to Off, and select "Allow Application to choose".