I am having a very similiar problem. My DVD Burner will recognize everything excepts blank DVD+/- R discs. It will play DVD movies, CD's, blank cd's, and blank DVD-RW. I thought it was just a bad burner, but just bought and installed a new one and the same problem. I removed all the old codecs and installed the ones from the link in a previous post, but the drive still won't recognize blank DVD-R's. This has got to be some kind of software issue, can anyone help?