You could try this: Set DVDShrink to output an ISO instead of files and enable burning with DVDDecrypter.
Hmm, I got Instant CD/DVD with my first DVD burner. Kinda bloated and buggy, didn't keep it long. Maybe someone has a fix for you, but I'd dump it. DVDDecrypter is small, free, and reliable.
To convert files to ISO image, use ImgTool Classic (free).