SSIs not working and no error generated

[wkennyspain]

SSI's on my index page work fine when it is found as the default page if I type estateagentsespana.com into browser address bar.

But if I type estateagentsespana.com/index.htm into the address bar, the SSIs are ignored. SSIs on other pages are also being ignored.

My htaccess:

AddType text/html .shtml
AddHandler server-parsed .html
AddHandler server-parsed .htm

<IfModule mod_rewrite.c>
RewriteEngine On

# redirect from non-www to www with https
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L] 

# redirect from http to https
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
</IfModule>

Options -Indexes

ErrorDocument 404 /404.htm

[wkennyspain]

Problem solved by web hosting company, but no explanation given of what was causing it.