I've got a Pioneer 103 that has worked well for a few years until now. If I burn a Memorex DVD rewritable using Nero, the burn completes successfully but when I try to read the disc my DVD writer and DVD ROM neither will read the disc. The Pioneer writer just spins and the ROM just sits there. I have some old RiData RW's that I can write to and everything goes fine. What is really strange is I have been able to write to the Memorex discs before.

Any thoughts?