I'm using template account_alert as my example . It shows up in the customized style components list, customized in 1.3.4. When I go to the template and click on view custom changes, I get the error. There is no account_alert in the master templates (this triggers the error). So has the template been eliminated in 1.3.4, but is it still there as a template because it existed in 1.1.x prior to upgrading? It's not in the TM list, so I didn't change it that way. Is it being used by my style in XF 1.3.4 (and actually doing something)? How can I tell?