I noticed a small but fatal error in the code on the default admin view for /mails/ when I updated to Joomla! 3.
JUtility::getToken() has been replaced by JSession::getFormToken() in Joomla! 3 and you have the former on line 24 of the default.php in the /mails folder.
Replacing it with the new JSession get token fixed the error for me.
I appreciate all your hard work on this extension. I use it every day.
|Extension version (x.y.z)||3.1.2|