I'm using the latest version of both WordPress and NextGen Gallery. After uploading pictures, I get a printout the following error (repeated at least 5 times):
expects parameter 2 to be string, array given in /home/grscgami/public_html/wp-content/plugins/wordpress-firewall-2/wordpress-firewall-2.php on line 226
I've now deactivated and deleted the plugin. I'll reinstall if and when these errors/warnings are fixed.