I have a Pioneer DVR-108 internal DVD recording drive. The firmware is current. It will read and record to a DVD+RW, but not a DVD+R. When a blank DVD+R is in the drive it shows up as a "CD Drive" but I can't write to it. I am using TDK 4x DVD+RW and TDK 8x DVD+R. Can anyone give me a guess as to why?