[horde] authentication trouble

[info at media-art.be]

Allright, I may be new to this,
but I shure as hell don't give up  soon.
And yes, I've been digging.
But starting with a huge app like this.
Well, to the point.
In the login.php, function authenticate is called,
which calls checkAuth in it's turn.

As I print the horde_user and horde_pass as debug code.
They seem fine, but still checkAuth() returns a 'false'
somehow.
Can somebody pleeeeaase get me through this.
I've been suffering all day, and I know, I probably
laugh with the matter in about a week.
But for now, I need someone to guide this horde-neewbie :)


Kurt