None at all, because you haven't described what you're environment is.
In your next post, tell us about how you use MC.
What file types do you use?
Any networking, library sharing going on?
Theatre view or standard?
Any 3rd party plugins installed?
Click on 'Help' in MC's toolbar and then click on 'System Info' and paste the result here too.
Again, click on Help > Logging and enable logging to file. Next time MC crashes on you, open the logging options again and view the file. Copy and paste the last 30 lines or so of the log into this thread. This will let the jriver team see what was happening immediately prior to your crash.
-marko.