creativejam

Like your avatar. BTW

1) Go to SlimStats Overview page.
2) In the Top Pages widget, click on one of the pages listed.

The URL in the link looks like this:
https://website.com/news/wp-admin/admin.php?page=wp-slim-view-2&fs%5Bresource_substring%5D=contains+%2Fnews%2F%3Fpage_id%3D3430

CapricousMind:

What I mean is to go through all the files in your updated WordPress, wp-admin and wp-includes directories and make sure that all of them are actually updated versions of the original files.

None of the previous solutions solved my problem with the same symptoms. But after much hair-pulling I discovered that the wp-settings.php file had NOT been written over by the new 2.6.2 version. So I updated that file with new 2.6.2 version of the file and voila – no more blank page on the site and no more looping on the login page. So, another possible cause of the blank page/login loop issue is a missing or non-updated file. So be sure to go through your 2.6.2 update and check to make sure that ALL the necessary files outside the wp-content folder were actually updated.