They are audio nrg images, so even though they were single session, it sounds as if ImgBurn will not burn them.
Thanks for the info. I still think ImgBurn is a great idea.
I was told ImgBurn will burn Nero .nrg images to CD. However, when I try to do this, it gives me an error message: "Invalid or unsupported image file format!" I have the file association set to recognize nrg images. How do I fix this?