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Thanks for sending me your FTP info. I found that it was the wpjobboard plugin that was conflicting. Apparently that plugin is intercepting all ajax calls and it is overriding the proper WordPress response, thus it breaks my login protection and any other script that utilized a standard WordPress ajax call.

I disabled that plugin by renaming the folder to xjobboard and the login page is now working properly. You should contact the plugin developer to request that they fix this but are at least provide you with a workaround. If you need to reactivate that plugin then you should turn off the login protection in the Anti-Malware Firewall Setting first.