I see you sent the DVD's off, but I got curious this morning. Found this. I realize it is for Win 7, but probably still pertinent. Couple of potential answers here. Your computer may be stuck in thinking you have something ready to burn.
Forbidden - Stack ExchangeSince you played them at one time it is safe to assume that you did finalize the burn. Burning a DVD is a multistep process that some people never complete
Edited by Theodoric, : No reason given.
What can be asserted without evidence can also be dismissed without evidence. -Christopher Hitchens
Facts don't lie or have an agenda. Facts are just facts
"God did it" is not an argument. It is an excuse for intellectual laziness.
If your viewpoint has merits and facts to back it up why would you have to lie?