Playback problem with some DVD-Audio disk on Pioneer 565A

I was hoping to hear if any body else has had any problem with there Pioneer 565A Universal player. The thing is that I have various DVD-audio and SACD disk and all of them play excellently. Then one day I bought The Blue man group DVD-audio disk the Complex. But when playing it in the player it produces no sound! No sound at all any matter if I chance the setting to 2.0 stereo. The only way to play the disk is to tell the player to play the DVD-Video section and Frome there I play the DTS soundtrack. At first I thought it was just the disk but then I bought the Porcupine Tree DVD-audio Deadwing and there I have the same problem. Have tryed it on another player and there it worked well. Any suggestions?