I don't know if others have this problem - but if you have, here is the solution.
Nero CD-Speed: "No additional sense information" error.
Nero burning ROM - various different errors when trying to write.
Solution: Exit CloneCD tray icon or turn off "Hide ATIP". Seems like the "Hide ATIP" function blocks some commands needed to write DVD-R discs. Strange thing is that DVD+R writing still works.
Other ATIP hiders may also cause such problems so swith them off if you have problems.