Another "4.0 Can't Login" Guy

On several of my sites, hosted on a dedicated private server, after I have upgraded to 4.0 I can’t login.

The site I will use in this example is https://adambehr.com/mobile.

First I get stuck in an endless loop of “Need to upgrade your database” messages. Googling that issue I check the db_version in phpMyAdmin, copy the version and change it in version.php via File Manager. That at least gets me to the point where it looks like I can login.

But I can’t. It doesn’t say that I used the “incorrect UN or PW” (unless I do), rather it just reloads the login page.

I have tried disabling all of the plugins and that did not help.

I have tried moving all themes except twentyfourteen our of the Themes folder. The site then just yields a blank page.

The cPanel’s Error Log shows this:

[Thu Sep 18 06:08:49 2014] [error] [client 217.77.158.226] File does not exist: /home/adambehr/public_html/head.jpg, referer: https://www.adambehr.com/ADAMresume.htm
[Thu Sep 18 06:07:34 2014] [error] [client 217.77.158.226] File does not exist: /home/adambehr/public_html/head.jpg, referer: https://www.adambehr.com/ADAMresume.htm
[Thu Sep 18 04:31:52 2014] [error] [client 117.26.255.56] File does not exist: /home/adambehr/public_html/editor, referer: https://adambehr.com/editor/FCKeditor/editor/dialog/fck_about.html
[Thu Sep 18 04:31:51 2014] [error] [client 117.26.255.56] File does not exist: /home/adambehr/public_html/editor, referer: https://adambehr.com/editor/editor/dialog/fck_about.html
[Thu Sep 18 04:31:51 2014] [error] [client 117.26.255.56] File does not exist: /home/adambehr/public_html/manage, referer: https://adambehr.com/manage/FCKeditor/editor/dialog/fck_about.html

The time stamp on those don’t reflect the times I’ve tried to login and when I do try to login again, a new error does not show up.

I also have a WP installation at https://adambehr.com/info that I have not upgraded to 4.0 and those may be related to that installation.

Help?