Plugins Reverting Themself To Older Versions

Question

While I'm using a custom theme that has some custom post types, a custom menu declaration, a support thumbnails declaration, and some Gravity Form's customization, whenever I try to update a plugin it updates, then a few page loads later the plugin reverts itself to the version previously installed. In some cases, it even corrupts the plugin and I can't use it anymore.

I have the following plugins installed, ACF, Akismet, and Posts2Posts. Here is the error hat I get with debug set to true

Notice: Undefined index: REQUEST_URI in /wp-content/plugins/one-category-only/oco.php on line 15 Notice: Undefined index: post in /wp-content/plugins/one-category-only/oco.php on line 29 Notice: wpdb::prepare was called incorrectly. The query argument of wpdb::prepare() must have a placeholder. Please see Debugging in WordPress for more information. (This message was added in version 3.9.) in wp-includes/functions.php on line 3245

I'm wondering if anyone has any suggestions for this?

Answer 1

This error clearly shows that you have a problem with a plugin called 'one-category-only'. You did not mention this in your question. Uninstall that plugin and see if your problem still exists. I would also suggest that you activate one of the default themes and test your plugins again to see if this solves your problem

Answer 2

The problem turned out to be a simple overlooked issue: we are using WPEngine's Git, and each time we pushed we were pushing our plugins with it. After adding the plugins directory to the .gitignore (the whole wp-content directory, actually) all was well.