There was a bug in the LinuxChix Mailman installation that caused people trying to view the archives to see this error:
Bug in Mailman version 2.1.5
We're sorry, we hit a bug!
Please inform the webmaster for this site of this problem. Printing of traceback and other system information has been explicitly inhibited, but the webmaster can find this information in the Mailman error logs.
This problem should now have been solved. If you see it again, please contact the volunteers list.