I have Sennheiser 120's, so the behavior should be the same.
Here is my current situation: I have all 6 inputs connected. All 6 have analog audio connected. For video, I have 2 s-video, 2 component, and 2 HDMI.
Normal playback, I have picture and sound on all 6 inputs.
With headphones connected to VCR out, I get sound on all inputs EXCEPT VCR. With headphones connected to DVR out, I get sound on all inputs EXCEPT DVR. I THINK this is normal behavior. If I actually had a VCR connected to the VCR jacks, or a DVR connected to the DVR jacks, the VCR/DVR out from the Denon is connected to the input of the respective machines. This is done so you can record a different source onto the VCR/DVR. You wouldn't want to record from the VCR/DVR itself. That would be a nonsense loop. Please correct me if you think I'm wrong. I believe my old Kenwood acted the same way.
With Zone 2 preout, I get no sound from any input, whether Zone 2 is set to source or if I scroll through the sources. Here is where I believe I have my problem. Must be a defective amp. I don't know if it has been bad from day 1, or recently developed. It's a moot point - it just doesn't work. The only thing I can think of is maybe there is some setting somewhere that isn't set right. Any ideas on that one??
My other question is - do you think it might help if I reset the microprocessor? (Got the idea from your signature ) I sorta don't want to, since it would be a lot of work to first copy down all my settings, then have to put them all back in. But if it would fix the problem, I would do it. I have a couple of workarounds for the problem, so it's not critical that I get it fixed.
At least this has been a learning experience for me. Thanks a lot for your help.