Title: MU Class Not Recognized
Last modified: July 11, 2017

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# MU Class Not Recognized

 *  Resolved [thisisbbc](https://wordpress.org/support/users/thisisbbc/)
 * (@thisisbbc)
 * [8 years, 11 months ago](https://wordpress.org/support/topic/mu-class-not-recognized/)
 * Hey there,
 * We recently noticed that PO was not active (Selective Loading was set to OFF).
 * After trying to reactivate it, it seems that our MU file is outdated.
 * We deleted and copied it multiple time, both using the provided tool and manually
   but without luck.
 * Any reason why that might happen? We’re using v9.2.1 both for the plugin and 
   MU class file.
 * Waiting for your feedback!
 * All best,
    B

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Jeff Sterup](https://wordpress.org/support/users/foomagoo/)
 * (@foomagoo)
 * [8 years, 11 months ago](https://wordpress.org/support/topic/mu-class-not-recognized/#post-9309095)
 * Are you using a caching plugin that will cache the database results? If the database
   returns an old version number then it will disable itself thinking you are running
   an old version of the plugin. Are you getting an admin error about plugin organizer
   not being setup correctly because you are running an old version of the MU plugin?
   Try running the query below on your database to see if the version number is 
   correct. Replace {DB_PREFIX} with your database table prefix. It will be wp_ 
   unless you set it to something else.
 * `SELECT * from {DB_PREFIX}options WHERE option_name='po_version_num'`
    -  This reply was modified 8 years, 11 months ago by [Jeff Sterup](https://wordpress.org/support/users/foomagoo/).
 *  Thread Starter [thisisbbc](https://wordpress.org/support/users/thisisbbc/)
 * (@thisisbbc)
 * [8 years, 11 months ago](https://wordpress.org/support/topic/mu-class-not-recognized/#post-9309387)
 * Not that we’re aware of but WPEngine is known to heavily cache their ressource
   so its entirely possible.
 * Looking at the settings today it seems the file has been recognized and now everything
   is working fine.
 * Just took a few hours!
 * Have a great day ahead

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘MU Class Not Recognized’ is closed to new replies.

 * ![](https://ps.w.org/plugin-organizer/assets/icon-256x256.png?rev=1786554)
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 * 2 replies
 * 2 participants
 * Last reply from: [thisisbbc](https://wordpress.org/support/users/thisisbbc/)
 * Last activity: [8 years, 11 months ago](https://wordpress.org/support/topic/mu-class-not-recognized/#post-9309387)
 * Status: resolved