only works on one site

I'm having some problems with mod_layout. I just installed 4.0.1 version
yesterday on Apache 2 yesterday. It seems to be working on one of my sites,
but not on all domains. I am using mod_layout to add urchin code to top of
pages for hit tracking. In Apache file, I have AllowOveride set to All, and
have no special directives except for each virtual host I have:

AddOutputFilter LAYOUT html
LayoutHeader /var/www/html/utm.html

And in the utm.html file I have <script src="http://serverip/__utm.js"
type="text/javascript"></script>

It doesn't look like entries are being added to .php or .htm files. Not
adding to .php is ok, but I need stuff added to .htm files. How can I fix
this? Do I just need to change:


AddOutputFilter LAYOUT html to

AddOutputFilter LAYOUT html htm

Help would be appreciated.

Thanks,

Skeeter