Hello,
1) I see. Would you be so kind as to describe in more details what requests were blocked by the firewall and the reasons why it was done? Maybe you have any useful information in the server logs. Because we faced one more user with the same issue and have some feeling that new uses will appear. We don’t have such issue on our installations, so, can’t find out with the errors without your assistance.
2) Provide us with FTP access to your site to update theme and core plugin to the latest version where some errors of the header builder were fixed. When we tried to update the theme using autoupdate we stacked with maintenance mode.
Regards