Working in Acid pro 11, after rendering some tracks, I went back to a song, and suddenly I couldn't hear any track, despite the fact that I could hear the click track, (The wood block) perfectly.
The I went to another song I had rendered and with the same soundcard settings, (Microsoft sound, mapper. I only use ASIO for recording),and all the same appearance but this songs I can hear everything.
Why would I hear the click, and not the audio tracks, (suddenly) but on the other tune with the same settings I can hear everything.

Clue: When I tried to render these tracks to test on another platform, (some of them are silent, regardless of if I render them as WAV or AIFF) AND a couple of them won't even play on iTunes or windows media.
Any help appreciated!

My specs:
Windows 10
Intel 19
64GB RAM
Acid pro 11