problem setting up RC3

[Aaron Solochek]

I just installed RC3 on a debian system.  I installed most of the 
requirements from the binary .debs, but built php with imap-ssl support.

Anyway, currently I can go to /horde and I get a login screen and the 
list of modules along the bottom of the page.  I can also goto test.php, 
and everything looks good.

So, my first question is:  where is it looking for a username/password?

but, not wanting that behaviour anyway, I uncommented the following in 
registry.php:

$this->registry['auth']['login'] = 'imp';
$this->registry['auth']['logout'] = 'imp';

assuming that I'd then I have something similar to what I had with 
imp2.2, ie, select a server and let the server handle the authentication.

What I got was a blank white page.

I don't even know where to start looking -- is this a config problem or 
something deeper?

-Aaron