Changing apache alias does not work in Cacti 0.8.7b

[cjc1103]

Hello, I have cacti installed on FreeBSD 7.0. I would like to change the default alias in apache for cacti. This should be easy, change the httpd.conf file, done.
The current configuration which works fine is:

Alias /cacti "/usr/local/share/cacti/"
<Location /cacti>
AllowOverride None
Options None
Order allow,deny
Allow from all
</Location>

I change the alias to:
Alias /newalias "/usr/local/share/cacti/"
<Location /newalias>
etc.
I then restart apache
Now when I go to the new alias (http://mywebsite/newalias), I get a php error:
Invalid PHP_SELF Path
I scratched my head for awhile before I changed the alias back to "cacti" to get it working again. OK, it's got to be some configuration parameter somewhere. Anyone have any ideas?
Thanks, Chris

[gandalf]

Please see http://forums.cacti.net/viewtopic.php?t=25759
Reinhard