wpDirAuth failing on WP v3.9.1

I recently installed 4 new instances of WordPress v3.9.1 with the wpDirAuth v1.7.6. PlugIn. It’s failing to perform successful AD authentication.

I can still login to local accounts.

I have an earlier instance of WP v3.4.2 with wpDirAuth and it works fine. I have their settings identical so its not an error with setup.

When I tail -f the debug.log I get the following error occuring:
[23-Jul-2014 15:22:32] PHP Notice: wp_setcookie is deprecated since version 2.5! Use wp_set_auth_cookie() instead. in /var/www/html/wp-includes/functions.php on line 3078

Is there a known issue (I havent found out about) with wpDirAuth under the newest WP install? Is there something else I should have setup that I havent mentioned?

Your input appreciated.
-Paul

https://wordpress.org/plugins/wpdirauth/