I found that
CopyToDVD creates a corrupt VTS_01_0.BUP file on DL DVDs. Being a backup file it is difficult to discover unless you try to open the VTS_01_0.BUP after the burn. I checked all the +DLs I burned with CopyToDVD and all the VTS_01_0.BUP files on all the DLs were corrupt. DVD5s burned with CopyToDVD were okay. Anyone else discovered this problem?
CopyToDVD V3.1.3.137
Ed