Have you tried:
– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the default theme to rule out any theme-specific problems?
– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.
– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress?
– increasing the available memory?
http://wordpress.org/support/topic/253495#post-1017842
– reviewing http://wordpress.org/support/topic/411649
Hi esmi,
Yes, I deactivated all the plugins. Indeed yes, it appears to make the problem go away. Yes, I tried reactivating them systematically. However, once I found a combination of plugins that restored most site functionality and seemed to work for one author, a different author’s stuff started breaking.
I didn’t try any of those other tricks; the memory limit thing seems like a plausible cause, but as I mentioned, I can’t find a log on the server that is at all revealing. I wish I had a systematic way to attack this problem, but it looks like I’ll be taking stabs in the dark for a while unless you have specific suggestions for diagnosis.
Thanks for your attention,
Dave
I’m having this problem with WP sites I’m moving to a new server. I’m beginning to think it’s a setting on the server because these same sites worked on the old server.
I deactivated all the plugins, backed up the database, installed on the new server – and it works fine until I start reactivating plugins. At some point, the admin screen goes blank when reactivating plugins. If I go back in the browser and refresh the page – no problem. No errors, and the plugin that caused the problem is activated.
However, when I log out I get another blank screen (no login box) and I usually have trouble logging back in again as well.
Like Dave, I am now searching the forums and this site for possible solutions.
I discovered the source of my problem and possibly it can help others.
I had hoped to change the DNS and have the site intact and live. As a result, I uploaded the WordPress files in a ZIP file through the CPanel and unzipped it on the server.
For my server at least, this apparently corrupted the WordPress files.
I had thought the WordPress files might be the problem, so for one site I uploaded the files through FTP and did an overwrite of the existing files. That didn’t resolve the problem either. However, when I deleted all the WordPress files on the server and uploaded them using FTP, the problem complete resolved.
Problem solved; it was a memory limit thing. Incidentally, the memory bump plugin mentioned in http://wordpress.org/support/topic/253495#post-1017842 didn’t do anything for me; I had to edit PhP.ini and restart the webserver.
