I just started E1M4 on OUWB and the sound, which has been working fine up to this point, has suddenly stopped playing. I've tried restarting, playing other levels, reloading my game, and it's not playing anywhere. The CD audio still works fine, the sound volume is turned up, and the sound test in the setup program works fine. Any suggestions?

Have you tried backing your saves up and reinstalling the game?

This happens quite often for me. A restarting of the game always seems to fix it.

This has happend to me before, restarting the Game always helps.