We support many different ways to customize your WHMCS installation, all of which have their own troubleshooting needs.
Troubleshooting system themes requires specific steps.
Troubleshoot and resolve empty pages while using WHMCS.
If you use custom themes or templates on a self-hosted WHMCS installation, you will need to update them for any changes in new WHMCS versions.
Troubleshoot and resolve You cannot delete the active system theme. errors when deleting themes in the Theme Editor addon module.
The Theme Editor addon module allows WHMCS Cloud users to create and update custom themes for the WHMCS Client Area.
Troubleshoot and resolve The system could not create the theme. errors when creating themes with the Theme Editor addon module.