I can't make copies of my (I made them myself so they are not copy protected) data discs. Every time I try, I get an error saying "unsupported media type." Is this an actual K3b problem or a DVD+RW problem or is it just my particular Blu-ray drive? (it will let me copy commercial (i.e., movies) discs. Any help is appreciated.
Thank you.

Running Mageia 5 64 bit with all the latest updates, including multimedia updates.