Had a problem with the "Confirm" button for the function "Clear and Rebuild Cache" of the Squid module.
It did nothing, when I click it.
This happend on two Ubuntu 12.04 with Webmin 1.670 installed by .deb from webmin.com.
To solve this I changed line 22 of webmin/squid/clear.cgi from
[ [ undef, $text{'clear_buttclear'} ] ]);
to
[ [ 'confirm', $text{'clear_buttclear'} ] ]);
and it works.
Thanks, I'll fix that up.