CloudLinux PHP Selector PHP modules not loaded on website

Symptoms

Enabled PHP Selector modules do not load after being saved.

Description 

A cPanel user uses PHP Selector to enable a PHP module, like mysqlnd, but the driver isn't loaded, and the website still fails because the module is missing.

Workaround

Typically, the user needs to be remounted via CageFS when this occurs by running the following commands:

cagefsctl --force-update

cagefsctl -m USER

Please note, you will want to replace USER in the above command with the actual cPanel username.