WP-Cache plugin for WordPress problems

In the last few months, [GAS] has gone down on occasions, mainly because of plugins problems. The one at the top of this list is the WP-Cache plugin for WordPress.

Strangely, this problem has only started about 4 or 5 months ago, when I decided to upgrade my installation of WordPress to a new build. At first, the problem was only occurring about once a month, but lately, things have really been starting to get out of control.

If your site is running the WP-Cache module and one day, you found your front page unavailable, try to access your WP-Login page. If it still loads, you’ll probably have found your culprit.

When this happens, the only way to get your site back up is to login to your dashboard, go to the WP-Cache section of the option menu and disable the plugin. When this is done, try to access your front page again. Does it load? If so, you can choose to keep the cache module disabled or follow the following steps to make it functional again:

  1. Login to your WordPress Dashboard
  2. Head over to Option -> WP-Cache
  3. Click on the “Disable it” button
  4. Click on the “Clear Cache” button
  5. Login to your site via FTP and head over to your “/wp-content/cache” directory
  6. Delete the wp_cache_mutex.lock file
  7. Go back to your Dashboard and re-enable the plugin.

Voilà, your site should now be back online. Please note that if the problem happened once, it will probably happen again.

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19 Responses to WP-Cache plugin for WordPress problems

  1. Interesting. I don't use wp-cache, because after reading how it works I immediately became suspicious of its reliability and decided to put it off until I had some time to exercise it properly in a test environment (which never happened).

    But I know that TDavid uses it on his site, apparently without problems.

  2. Interesting. I don't use wp-cache, because after reading how it works I immediately became suspicious of its reliability and decided to put it off until I had some time to exercise it properly in a test environment (which never happened).

    But I know that TDavid uses it on his site, apparently without problems.

  3. I have had similar problems with wp-cache. My list of posts disappeared completely until I disabled it in the plugins page (not the wp-cache configuration page- that doesn't work!).Just to prove wp-cache was the problem I reactivated it and my posts disappeared again only to reappear on disabling it! It doesn't play nicely with wp-print – it causes a fatal error. Just a word of warning. Follow the above instructions exactly. I disabled it on the plugins page(not the configuration page) and deleted the wp_cache_mutex.lock file. My site disappeared until I uploaded a wp_cache_mutex.lock file from the original download, re-enabled it then disabled it properly!

  4. I have had similar problems with wp-cache. My list of posts disappeared completely until I disabled it in the plugins page (not the wp-cache configuration page- that doesn’t work!).Just to prove wp-cache was the problem I reactivated it and my posts disappeared again only to reappear on disabling it! It doesn’t play nicely with wp-print – it causes a fatal error. Just a word of warning. Follow the above instructions exactly. I disabled it on the plugins page(not the configuration page) and deleted the wp_cache_mutex.lock file. My site disappeared until I uploaded a wp_cache_mutex.lock file from the original download, re-enabled it then disabled it properly!

  5. I have had similar problems with wp-cache. My list of posts disappeared completely until I disabled it in the plugins page (not the wp-cache configuration page- that doesn’t work!).Just to prove wp-cache was the problem I reactivated it and my posts disappeared again only to reappear on disabling it! It doesn’t play nicely with wp-print – it causes a fatal error. Just a word of warning. Follow the above instructions exactly. I disabled it on the plugins page(not the configuration page) and deleted the wp_cache_mutex.lock file. My site disappeared until I uploaded a wp_cache_mutex.lock file from the original download, re-enabled it then disabled it properly!

  6. I have had similar problems with wp-cache. My list of posts disappeared completely until I disabled it in the plugins page (not the wp-cache configuration page- that doesn’t work!).Just to prove wp-cache was the problem I reactivated it and my posts disappeared again only to reappear on disabling it! It doesn’t play nicely with wp-print – it causes a fatal error. Just a word of warning. Follow the above instructions exactly. I disabled it on the plugins page(not the configuration page) and deleted the wp_cache_mutex.lock file. My site disappeared until I uploaded a wp_cache_mutex.lock file from the original download, re-enabled it then disabled it properly!

  7. So…what if you're forced to use a windows server, and the piece of crap won't delete the lock file?

    I've ahd to delete & reinstall WordPress 3 times…and i still can't get it to work. How do you disable the plugin, if the piece of junk won't let you at the panel?

      • thanx man. that solved the problem for me.

        before that, I couldn't even login to my admin panel because of the error. i renamed the wp-cache folder name and deleted the files from the cache folder and voila, my site started working again. :)

  8. So…what if you’re forced to use a windows server, and the piece of crap won’t delete the lock file?

    I’ve ahd to delete & reinstall WordPress 3 times…and i still can’t get it to work. How do you disable the plugin, if the piece of junk won’t let you at the panel?

      • thanx man. that solved the problem for me.

        before that, I couldn’t even login to my admin panel because of the error. i renamed the wp-cache folder name and deleted the files from the cache folder and voila, my site started working again. :)

  9. thanx man. that solved the problem for me.

    before that, I couldn't even login to my admin panel because of the error. i renamed the wp-cache folder name and deleted the files from the cache folder and voila, my site started working again. :)

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