I am using dvd shrink 3.2 and opened files of a dvd that I decrypted using dvddecrypter. When I click on the Backup tab at the top of the page, I then click on quality settings. I want to enable "Perform deep analysis before backup to improve quality, but the box is not highlighted, so I cannot select this option if I wanted. I was able to select this option when I first used the program on another dvd successfully, but I can't now. What can I do to correct this? Please advise. Thanks in advance.