Quoting Walter Garcia-Fontes walter.garcia@upf.edu:
I have found out recently that on the admin page for administering permissions after changing any permission I get a "blank page of death". The permission is changed anyway, and everything else continues working normally after hitting the "back" key or opening any part of my site.
I'm using 5.6 (planning to update to 5.7 anytime soon, but haven't found the time to do it).
How would I go diagnosing this? Which logs are useful to check, or anything else that would help me diagnosing a "blank page of death"? It's sort of frustrating to not get any type of error message in this type of situations.
Usually caused by some PHP error; of which out of memory is the most common. Check the watchdog log admin/logs/watchdog to see if there are any php errors posted there. Else check the logs for your php environment.
You can also modify the .htaccess and add
php_value display_errors 1 php_value memory_limit 64M
The display_errors should only be used for debugging and set to zero for production. The memory_limit can be adjusted higher and be a permanent addition or you can modify the php.ini file to set it globally for all applications using php.
Earnie -- http://for-my-kids.com/ -- http://give-me-an-offer.com/