Cannot enable/disable WP Toolkit

Symptoms

You have enabled the WP Toolkit Deluxe option within the Feature Manager, but when reloading the Feature List, the option is no longer enabled. Alternatively, you have tried the disable the option, but it remains enabled. 

Description 

On servers that once had the WP Manager plugin installed, certain settings files left over from uninstalling this plugin may be overriding the Feature List's visible selection and preventing it from being updated in the Feature Manager.

Workaround

Move any "cpaddons" files out from the features directory. Once removed, the Feature Manager will reflect the current setting and allow itself to be updated normally:

# mv /var/cpanel/features/*.cpaddons /root/ -v
‘/var/cpanel/features/default.cpaddons’ -> ‘/root/default.cpaddons’
‘/var/cpanel/features/rouge.cpaddons’ -> ‘/root/rouge.cpaddons’
‘/var/cpanel/features/azure.cpaddons’ -> ‘/root/azure.cpaddons’
‘/var/cpanel/features/vermillion.cpaddons’ -> ‘/root/vermillion.cpaddons’