SSI and Virtual Mass Hosting

Hi!

I had changed my VirtualHosts using mod_vhost_alias and now my httpd.conf contains these:

VirtualDocumentRoot /usr/local/virtualhost/%0

and in /usr/local/virtualhost I have symlinks to /home/users/www...

Well, some users have on their pages some .shtml, and they were running perfectly. Now, don't.

I tried to put the permissions on /usr/local/virtualhost through

<Directory "/usr/local/virtualhost">
Options Includes FollowSymLinks
...
...
</Directory>

But didn't work... what is going wrong!
I know that would be better use .php than .shtml (that works fine), but I'm very curious. =)

Thanks a lot for your help.