I had this problem when I upgraded my 5.0.3.5 which came with my CDRW to 5.5.2.3
It turned out to be a problem with the Nero upgrade. They posted a new 5.5.2.3 which has worked fine for me and solved this issue. I've since gone to 5.5.2.4 which also works fine.
I don't know what version of Nero you have, but you may want to d/l the latest upgrade and give it a whirl.