It doesn't really matter. Half the time, if I just close the project - without closing Sonar - it still locks up. It's like it never finishes saving or something, and I sit there with a non-responsive blank Sonar page. And it seems like it doesn't matter how long I let it sit there, it never finishes flushing out the system. The frustrating part is, while the program is non-responsive, it isn't "bricked." I mean that if I tell the computer to shut down, it all closes out immediately. It's not like it's locked up in the system and I have to force it to shut down. But if I'm not restarting, it will sit there forever unless I either force it to close in Task Manager (and hope it actually closes), or restart the computer. And this is between EVERY PROJECT now. It's insanely unproductive.
Side note: it might have to do with the plug-ins not shutting down. I don't seem to have a problem with opening/closing dry projects with little-to-no processing attached. But when I have something with a dozen or more plug-ins going, it won't close out willingly. It's actually frozen now: I closed a project (without closing Sonar), and it's completely unresponsive. And forcing the application to close doesn't mean much: the process thread won't close. So it's time for another reboot.
Seriously, I'm glad I don't have an artist looking over my shoulder while I'm working on their music. They wouldn't trust me with their files. Please, Sonar, this needs to get fixed.