I've got a TS-L532A in a new laptop I bought last week. It seems to have the same issue with -R media - the first disk was ok (I think a G.04) but subsequent burns of CMC.MAG (I think...) and both G.05 and G.04 give verify errors in Nero, which is the latest version.
Burning +RW and +R disks give no errors.
I did a disk quality scan on two of the failed -R disks, and there were significant problems with them beyond around the 30-40% point, so I'm not sure if it is just verify. One disk seemed to play back on my Panasonic E85 DVD recorder, but it did break up around one chapter point, so there's definitely something wrong.