Not sure. I think it has something to do with the format. I am getting a pop up message which I reply too, but it doesn't seem to make a difference. Pop up message gives me two choices, Live File System format or Mastered format. Choices are How do you want to burn this dvd? LIke a USB flash drive or With a cd/dvd player. I select cd/dvd player but it's not working. Would it make a difference if I uninstalled the software, did a restart and downloaded the software again. Didn't have this problem until I replaced the dvd drive.