New user of CloneDVD2 with problem

I have successfully copied five movies using Memorex DVD+RW. I switch media on my sixth movie (TEON DVD-R 8x) and my drive will not recognize the media. The message is to insert a recordable media in the drive. In the Writing line in parenthesis it says that the drive is not ready. Any help?

update drive firmware and/or go back to memorex