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1. jorgitobg
   Member
   Posted 5 months ago #

   Hi,

   We use wordpress since 2006 on site hermandadblanca.org, we receive more than 200.000 visits per month.

   A few weeks ago several lectors and users complain me that from time to time they cant see (cached), or work (not cached), pages from site because the only thing they can see its a blank page.... after some minuts page begins to work again.

   After much research this problem only happens with wp-super-cache active, I tried many changes on configuration but still the same problem....

   We work on a dedicated server with enough memory and cpu, at the moment we have define('WP_MEMORY_LIMIT', '512M');, but we have raised memory several times for testing if it is the cause, and problem still the same... we use wordpress 3.3, wp-super-cache, wp-minify, and many other plugins....

   I like wp-super-cache and I need to fix this blank pages.... Any help will be very appreciated...

   Regards,

   http://wordpress.org/extend/plugins/wp-super-cache/

2. Donncha O Caoimh
   Member
   Posted 5 months ago #

   Are you using an external object cache? WordPress 3.3 made a change to the object cache that affects some users :(

   Anything in your error log?

3. jorgitobg
   Member
   Posted 5 months ago #

   Hi Donncha,

   THANKS for you fast reply.

   Im not using any object cache... i send you a list from our active plugins and our error log from wp-super-cache:

   Activate Update Services, Akismet, CDN Sync Tool, Formulario de Contacto 7, Custom Post Templates, Custom Post Type UI, Flickr Gallery, Google Analytics Dashboard, Jetpack by WordPress.com, Members, nrelate Related Content, Smooth Slider, Subscribe to Comments Reloaded, Tabbed Widgets, TinyMCE Avanced, Use Google Libraries, Viper's Video Quicktags, Wibiya Toolbar, WordPress Media Flickr, WordPress MU Domain Mapping, WordPress SEO, WP-DBManager, WP-DownloadManager, WP-PageNavi, WPaudio, WP Minify, WP Super Cache, WP System Health

   LOG-----------------------------------------------------
   http://hermandadblanca.org/wp-content/cache/a5c5413adef73671101431d942021cae.txt

   Regards,

4. Donncha O Caoimh
   Member
   Posted 4 months ago #

   Thanks for the log file, you missed the most obvious warning:
   "Buffer is blank. Output buffer may have been corrupted by another plugin or this is a redirected URL. Look for text 'ob_start' in the files of your plugins directory."

   That's repeated multiple times so there could be a plugin already using the output buffer. I haven't used all those plugins so I can't tell which one it might be. :(

5. jorgitobg
   Member
   Posted 4 months ago #

   Hi Donncha,

   I see a lot of "ob_start" on log file but these warning points to bad url (404) or to URL redirects... /download/.... etc

   I have searched for plugins with ob_start calls and tested to deactivate all plugins and activate one to one for watching something strange on log but nothing...

   Did you see some clue to our blank pages on this new log?
   http://hermandadblanca.org/wp-content/cache/a26971929491c57c4db9f6854775e455.txt

   Ah! other question Donna, if i activate "compress pagess" the output content for cached pages (not logged users) is a lot of strange characters... but i remember some time ago i have this option active, how could i get compress back?.

   Regards,

6. jorgitobg
   Member
   Posted 4 months ago #

   Hi Donncha,

   We still have the same issue... aleatory blank pages... if i disable wp-super-cache and use other cache plugin the issue dissapear..

   But i like super-cache and i hope we can find the problem.

   Regards,

7. jorgitobg
   Member
   Posted 4 months ago #

   Hi Donna,

   Im just discover that if when we receive blank pages while almost 5 or 10 minuts.... i clear the cache using the URL:

   http://hermandadblanca.org/wp-admin/options-general.php?page=wpsupercache&action=delete&path=%2Fwp-admin%2Findex.php&_wpnonce=08a8b39603

   All backs again to normality... any idea why this clear cache affects to wp-super-cache to serve a blank page or not?.

   Regards,

8. jorgitobg
   Member
   Posted 4 months ago #

   Well... now this doesnt work...

   After make a change on wp-minify all site goes to blank pages again, i begin to suspect this plugin is guilty of all this problems.... i have tried to clear cache but nothing.

   The only thing works for "recover" site is deleting wp-content/advanced-cache.php

   Still testing...

9. Donncha O Caoimh
   Member
   Posted 4 months ago #

   Have you checked your PHP error log?

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