How to troubleshoot white screen of death (WSOD) after admin login – move of Drupal website

In our experience it happens from time to time that one gets a "white screen of death" - short WSOD - after the login with the admin account. Most frequently this happens after the move of a Drupal website to a new host. This is of course very odd and can lead to a very time consuming troubleshooting. Unfortunately we did not find out the precise causes and we couldn't find clear answers either. But processing the following set of measures always helps us to resolve the problem.

  1. Deletion of one of the duplicated ctools folder in sites/all/modules or sites/all/modules/contrib
  2. Incrementation of PHP Memory limit to at least 256M
  3. Copying of original .htaccess from Drupal installation
  4. Check-up and correction of user rights, 755 and 440 special files

Furthermore there is a workaround for the login: Create an editor with almost full rights - you have to uncheck "flush caches" and "Use the administration pages and help" - before the move, allowing you to login and perform almost all the operations.

General information about white screens of death (WSOD):
Blank pages or "white screen of death" (WSOD)
Fixing white screens step by step

Sad unhappy Drupal
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