I think I found the culprit, though I wish I knew more, specifically, about what was causing the issue.
I recently purchased a 2TB WD My Passport external hard drive. If it's plugged in when I launch Sonar and I open up a project right away, it crashes 99% of the time. If I unplug it before launching Sonar, I can open a project immediately without issue.
Additionally, I've discovered that having it plugged in when I turn my computer on, significantly slows down my boot time.
Anyone have thoughts about why this might be happening? I have other external drives and they've never caused either of these issues.
Thanks.