Currently, the only addons that can interfere with this are AdminCPFirewall and Two Factor Authentication.
I disabled TFA on my profile, so that's no longer required and AdminCPFirewall shouldn't block me logging in. It's sending me an email to say that I have logged in via an unknown IP (but I'm not logged in to ACP?) as standard, never caused an issue before.
My internal_data and data are chmodded to 0777 and it has been working fine in every way for about 18 days until this (started 2 hours ago?).
I'm running xF 1.3.3 on Apache on a CentOS 6.5 VPS.
Could you give me some help with this or any ideas. Thanks.