conf.php contained garbage at the end; I have no idea how it got 
there. All I did was to run admin -> configuration and saw that it 
said Horde config needed to be updated, so that's what I did. I 
removed the garbage manually and everything works OK now (well, apart 
from the segfault with the left panel).

This is probably the most basic call of the Horde framework, so you 
can be sure that a lot of people noticed if it didn't work. It's 
probably a configuration or installation issue on your side, you need 
to debug that yourself. With the information you provided we can't 
help you any further.

I've enabled debugging level logging, everywhere.. no go. Horde fails 
to start-up. An application in the same directory as Horde (test.php) 
that does not rely on Horde works just fine. I've traced it to this in 
base.php (the added call to error_reporting() is my code), it nevers 
gets to "die ('foo')". This is latest HEAD:



error_reporting (E_ALL);

if (Util::nonInputVar('session_control') == 'none') {

     $registry = &Registry::singleton(HORDE_SESSION_NONE);

} else {

     $registry = &Registry::singleton();

}

die('foo');