Deck C not audible in Two Deck mode?

I made a mix the other night running an acapella loop on Deck C.

When I play back the NMX file I don't hear Deck C or D unless I have all Decks showing.

A couple of questions:
1. Shouldn't the mix playback make all decks & anything captured in the mix file audible?
2. Will it be audible if I write the mix in 2 deck mode?
3. It appears that the Deck audio will cut out if you toggle between 2 deck and 4 deck mode - is this a bug? What if you purposely or mistakenly change modes during a live set?
4. If this is purposely designed this way - what is the rationale?

Thanks

FYI - would love to see the search functionality more like a typical Windows search - ie, hit letter L on the keyboard and be taken to the first L in my playlist or music folder...and somehow only make the mouse control the scroll on the scroll bar but stop when you move to hit the track...every time i use the scroll bar and find a track i have to click once to stop the scroll or when i move the pointer it continues scrolling and I have to research...very annoying (maybe there is another place to post requests?)

 

To clarify - I had tracks running on Decks A and B, and an acapella on Deck C

 

When only two decks are visible Decks C & D are muted and disabled when the decks are made invisible. This is by design.

Phil