I don't know if anyone else has discovered this...
You slave away on a song and suddenly, the Fault Reporter (FR) comes up, saying you've got a fatal error, blah, blah, blah. Contained in the first line of the FR dialog is the culprit (typically a plugin). What to do?
You can delete the track with the plugin (even though the FR dialog is still open). Then save your work. Then click YES or NO on the FR and let Sonar crash. Open up the same song--
Voila!--recovered!