4.79. I upgraded mailman, but now the web interface says "Bug in Mailman version X.Y.Z" and the apache error log says "IOError: [[../Errno 13|Errno 13]] Permission denied: '/usr/local/mailman/logs/error'"
This could be due to the log files not being group writable. The driver script is executed by one of the setgid wrappers (like listinfo) so it has the mailman group, but it is running as the same user as the web server (often www), so the log files have to be group writable.
Converted from the Mailman FAQ Wizard
This is one of many Frequently Asked Questions.