We haven't seen this in house or had anyone else report this. Does it happen in default aircraft? Have you removed all add ons? If it is still happening, please send a bug report that includes the exact steps you take to cause it to happen, a copy of the log.txt from immediately after the crash, and the Apple crash report (found in your user name /Libraries/Logs/DiagnosticReports). You may have to show hidden folders to access the crash report.