I had upgraded a few of my blogs recently, but not actually logged in and posted anything. I went to write something on this blog yesterday and couldn’t log in. I was freaked, tried it on another blog and had the same thing. I was looking at my databases and did all kinds of thing, re-installed WP manually, nothing worked, looked for stuff in wp-config.php and there was nothing wrong.

I just couldn’t log in, and it acted weird and with some stuff I did this blog disappeared, but a re-upload of wp-admin and wp-includes brought it back, but I still only got white pages with no action going on when trying to login or load anything admin manually, except for “upgrade.php” – that worked.

“Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.”

On a different blog this morning, I had the same stuff happening at first, but I knew not to do some things I had done, and was presented with errors and warnings and I found my fix by searching one of those header warnings.

It’s simple.

In FTP or however you manage your files, open wp-config.php with notepad (or whatever plain text program you use) … Save As, it will have UTF-8 as the encoding, change that to ANSI and save, upload it to replace the prior copy of wp-config.php

Voila! You can now log in. It really was “magic”.

Trying to login you are presented with an error and then blank pages that are empty and do nothing. Very frustrating.

It’s so simple. If you have this happen, only try that fix first, just save wp-config.php as ANSI and upload to replace what is on your server. You just may save your hair and mind. Simple as that.

“Warning: Cannot modify header information – headers already sent by (output started at  wp-admin/includes/template.php:1642) in  wp-includes/pluggable.php on line 876”

Others have said that it will not really fix the problem, there’s something wrong with a plugin. I don’t know about that, but what happened on my wordpress installs: all errors vanished as soon as I applied that simple fix.

The only thing same about them was WP upgrade in the last few weeks. None of them share all the same plugins or themes. Other blogs I haven’t upgraded past 3.5 yet, and are all fine, FWIW.