I just found this tonight. I had an old version of a project that I got rid of by removing the directory but because I had the project open to make sure I wanted to get rid of it, it still shows up in the recent project list.
I've been able to reproduce it pretty reliably.
To reproduce:
1. Create a new project, save it, then exit Sonar
2. Go to your Cakewalk Projects directory and delete the directory created for the project.
3. Start Sonar and open an existing project.
4. Close the project.
5. Select the deleted project from the recent projects list
Crash!
Is anyone else seeing this?