WL 6 and 7 burning issues

Just tried again on Macbook Pro. I click on CD-extra but WL7 finalizes the CD, same as on my PC.
I cannot add the PDF on the CD.

2 computers, 2 different platforms, same results.

Help. I need to deliver this tomorrow.
After 2 hours of trying to burn with WL6 with no success, my only option now is WL7.