Missing template handler (CFMX patch)

Following the recent MX patch for the referer cross site scripting problem, I thought it was about time I added a 'missing template handler' to one of our MX 6.1 j2EE installs. But CF appears to be ignoring the setting and displaying the default error page. Does anyone know what this might be

Re: Missing template handler (CFMX patch)

Have you tried entering different paths for the missing template handler in the CFadmin page? I ask because the missing template handler path is based off the context root, but mappings are specified from the system root. I'm always forgetting which is which. Doesn't make much sense, but