I must have hit a key I'm unaware of. I added a video track and it's dark, and every time I add another video track it's dark also. Nothing on these new tracks show on preview. What's up with this?

Never mind, found the issue, the solo button seems to be off by default, not sure why. All is well now.

Solo buttons *should* be off by default. You should only turn on Solo when you want to solo a specific track.

Thanks Edward.