I am using a licensed version of AnyDVD, Ver. 22.214.171.124. My PC setup has not changed and I can play the original in the player. But, after trying 2 copies, neither will provide the audio. I am using Power DVD7 but confirmed the problem by attempting to play the burned DVD using WMP 11 - no sound again.
So, I think it’s the SW and I believe I just upgraded it.
Just played a copy of The Matador and it works fine.