Yet another fastcgi problem

hi,

Since I got rt working as a fastcgi virtual host with apache, another
virtual host running mediawiki stopped working:

Sat Jun 09 11:31:40 2012] [error] [client 192.168.0.21] FastCGI: invalid
(dynamic) server “/var/www/html/mediawiki/”: script is a directory!
[Sat Jun 09 11:31:40 2012] [error] [client 192.168.0.21] FastCGI: invalid
(dynamic) server “/var/www/error/noindex.html”: access for server (uid -1,
gid -1) not allowed: execute not allowed

If I do not load the fastcgi module and rt vhost, then it works as
expected. So running rt broke the other vhost.

Is it possible to run fastcgi with stock mod_php (or whatever its name in
rhel is), or do I have to run everything as fastcgi? In that case I think I
might choose the reverse proxy route with starman.
Groeten,
natxo