Index.php not executing (Apache2 & websvn on debian.)

I want to use websvn to view my repository on a laptop and so only
need a minimal config. Hoped it would work out of the box like
Debian normally does but...

"/websvn/" and "/websvn/index.php" both present a download option,
instead of executing the php like it should. Now, I know this is a
mega-FAQ, but here's what's odd:

In my config:

DirectoryIndex index.html index.cgi index.pl index.php index.xhtml
AddType application/x-httpd-php .php


Now, if I call any php script *except* index.php, it runs fine. Also,
if I make a symbolic link like this: 'ln -s index.php test.php', the
exact same script does what it's supposed to do when run from a
diferently named link. So, PHP definitely works in general.


So, it's just that one name (index.php) that won't work correctly.
I've configured and run 1.3 for a while, but for some reason I'm
missing something simple (and probably stupid).

Thank you.