I opened a project file, the last one I had opened, and the track view is missing. If I click on 'views' 'track view' nothing happens.
 
If I minimize 'console view' which is on top, I get a blank gray screen with a tool bar on top.
 
I got the same result with a few different versions/project files of this song. I loaded another song I was working on recently and that one is alright. What's going on here?

Okay, with the blank screen up, I clicked 'views' track view' and it reappeared.
 
I've only been using Sonar since Sonar 6 so I haven't quite figured out the UI yet