I'd recommend capturing a log file. Then you can attach that log file here and hopefully it will show the problem.
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For the Logging system to work, you have to turn it on first.
With MC running, go to: Help > Logging.
Enable the Output to a Log file option.
Once you've been able to reproduce an issue with Logging enabled, you can collect a Problem Report package that will help diagnose the issue.
Re-open Help > Logging.
Click the Report Problem button.
Save the zip file somewhere you can find it easily, such as on your Desktop.
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From:
http://wiki.jriver.com/index.php/LoggingBrian.