zman, looks like the code may be different from 4.0.11 to 4.0.17.
without seeing your entire home.tpl, it's hard to tell. you can also try commenting out just the include, something like this:
Code:
{if $active_modules.Users_online ne ""}
{ include file="modules/Users_online/menu_users_online.tpl" }
{/if}
to this
Code:
{if $active_modules.Users_online ne ""}
{*{ include file="modules/Users_online/menu_users_online.tpl" }
*}
{/if}
mike