[charlie_ps2]

If you have had VD-R working before and they have stopped working now then here are the likely causes (any or all):

1 Your DVD laser diode has been weakened/defeated by the Neo2.2 - a well known problem

2 Your laser lens is dirty and should be cleaned with a C lens cleaning disk

3 Your DVD-Rs need washing in warm soapy water

That's just three possibilities. Two and three can be dealt with quickly leaving one a certainty if the other two fail.