I'm glad you got that problem solved.

With dCW you can set the file format (ISO, Joliet). After you press the Burn icon and you come to the CD Ready To Burn window (where you can enable BurnProof) click on the button that says Advanced. Here you can also give your CD a title.

As for Track at Once, I feel fairly sure that this only applies to CDs burned to standard audio format and not to data disks (like your mp3 disk). I am unable to determine whether dCW uses Track at Once or not. It is possible that it might but I am not sure about this. I see no option for turning this feature off or on.

Again, congratulations and best wishes,
Bill