I had my first crash today. Small project - seventeen audio tracks. Not many FX. All I did was press 'I' to open the Inspector. I got a 'Sonar PDR has stopped working' but unfortunately no fault reporter after that, just total exit.
I'd been using Melodyne 2.1 but I got no problems whilst doing so - not like the ones I'd been plagued with for over a year ref. memory leaks and that forced me to buy Studio One for my Melodyne work! There was one instance of Melodyne on one track when the crash happened. Luckily I'd saved the project just beforehand so I was able to re-open it, after which clicking 'I' hasn't caused a problem.
Maybe Sonar and Melodyne are destined to live together in uneasy co-existence rather than a full state of happiness.