problems with missing template handler

Hello,
We have put the name testmiss.cfm in the missing template handler in the administrator. Still, the default ColdFusion error message shows when a cfinclude has template=a nonexisting file and when in an html form,
action=a nonexisting cfm file. I have testmiss.cfm in both the root with Application.cfm and the directory with all the other cfms but still no luck.
Any idea what we are doing wrong?
Thank you very much.