I assume it recognizes factory made DVDs just fine?
RW opticals are finicky that way. It's been known a RW disc burn on one machine can't be read by another. It seems they are not calibrated equally and or easily get out of alignment, and on top of that, RW media actually "wears out" over time, it has a shelf life, and it wears out faster if exposed to sunlight.
Attempt to clean the drive, that's all you can do. After that, go a buddy's PC and see if you have better luck there.