Title: Issues activating/deactivating plugins
Last modified: August 21, 2016

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# Issues activating/deactivating plugins

 *  [Stanislav Khromov](https://wordpress.org/support/users/khromov/)
 * (@khromov)
 * [12 years, 6 months ago](https://wordpress.org/support/topic/issues-activatingdeactivating-plugins/)
 * I’m having issues with activating/deactivating plugins after installing this 
   on WP 3.7.1. Clearing the APC cache solves the issues.
 * Any ideas?
 * [http://wordpress.org/plugins/apc/](http://wordpress.org/plugins/apc/)

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [Peter Booker](https://wordpress.org/support/users/peterbooker/)
 * (@peterbooker)
 * [12 years, 6 months ago](https://wordpress.org/support/topic/issues-activatingdeactivating-plugins/#post-4347206)
 * Hi khromov,
 * I had a similar problem which turned out to be caused by PHP running many workers/
   threads with APC’s cache per worker/thread. So once a page changes on one worker/
   thread, the other workers do not know.
 * If this is the problem you may also find that if you make/update a post, it isn’t
   always visible on every page refresh, depending on which thread/worker the page
   was served by.
 * I did not find a way to get PHP workers/threads using a shared APC cache and 
   ended up disabling the workers/threads in PHP until I get it working.
 * If this is the problem you are having, is unfortunately a server configuration
   is which will be difficult to have resolved here.
 *  Thread Starter [Stanislav Khromov](https://wordpress.org/support/users/khromov/)
 * (@khromov)
 * [12 years, 6 months ago](https://wordpress.org/support/topic/issues-activatingdeactivating-plugins/#post-4347237)
 * Peter,
 * What server are you running?
 * With Apache + prefork MPM, the default is one APC memory pool for all workers.
   So I do not believe what you are describing is related to my issue.
 * What exactly did you do to “disable workers/threads” in PHP?
 *  [Rodrigo Primo](https://wordpress.org/support/users/rodrigosprimo/)
 * (@rodrigosprimo)
 * [12 years, 3 months ago](https://wordpress.org/support/topic/issues-activatingdeactivating-plugins/#post-4347408)
 * Same issue here on my development machine with Apache 2.2.22 + PHP 5.4.9 + APC
   3.1.13 and the latest version of the plugin.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Issues activating/deactivating plugins’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/apc.svg)
 * [APC Object Cache Backend](https://wordpress.org/plugins/apc/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/apc/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/apc/)
 * [Active Topics](https://wordpress.org/support/plugin/apc/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/apc/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/apc/reviews/)

 * 3 replies
 * 3 participants
 * Last reply from: [Rodrigo Primo](https://wordpress.org/support/users/rodrigosprimo/)
 * Last activity: [12 years, 3 months ago](https://wordpress.org/support/topic/issues-activatingdeactivating-plugins/#post-4347408)
 * Status: not resolved