[imp] IMP RC-3 login problem

[Steve Lidie]

Progress!

I had these options set for experimentation:

$conf['server']['change_server'] = true;
$conf['server']['change_port'] = true;
$conf['server']['change_protocol'] = true;

Simply reverting to the default values of false AND setting 'protocol' => 
'imap' allows
me to login.

An observation:

First login displays a proper mailbox and all option buttons:

     INBOX 
	Compose 
	Folders 
	Options 
	Search 
	Help 
	Addressbook 
	Logout 	

If I logout and login in again, I get a garbled screen with just Options 
and Logout buttons.
If I refresh the page I get:

Not Found
The requested URL /horde/http://hostname/horde/login.php was not found on 
this server.