[turba] Problem with Turba 1.2.2

[Per Steinar Iversen]

I am trying to setup a new box for our webmail service and want to use
horde-2.2.5, imp-3.2.3 and turba-1.2.2 for this. The platform used is
RedHat AS3, PHP 4.3.5RC3. The LDAP server runs OpenLDAP 2.1.27

Everything works very well, apart from Turba. My turba/config/sources.php
looks like this:

$cfgSources['tilsatt'] = array(
    'title' => 'HiO tilsatt',
    'type' => 'ldap',
    'params' => array(
        'server' => 'ldap.hio.no',
        'port' => 389,
        'root' => 'ou=tilsatt,dc=hio,dc=no',
        'encoding' => 'utf8',
    ),
    'map' => array(
        '__key' => 'dn',
        'name' => 'cn',
        'email' => 'mail',
        'alias' => 'uid'
    ),
    'search' => array(
        'name',
        'email',
        'alias'
    ),
    'public' => true,
    'readonly' => true,
    'export' => true
);

This works somewhat, this is from the ldap log when looking for "iversen" :

conn=368 fd=291 ACCEPT from IP=2001:700:700:1:2c0:9fff:fe35:266d 33128 (IP=:: 389) 
conn=368 op=0 BIND dn="" method=128 
conn=368 op=0 RESULT tag=97 err=0 text= 
conn=368 op=1 SRCH base="ou=tilsatt,dc=hio,dc=no" scope=2 filter="(|(|(cn=*iversen*)))" 
conn=368 op=1 SRCH attr=dn cn mail uid sn 
conn=368 op=1 SEARCH RESULT tag=101 err=0 nentries=2 text= 
get_filter: unknown filter type=48 

The "unknown filter" message occurs with recent OpenLDAP servers, the
older ones do not seems to mind the slightly strange filter that Turba 
uses.

I get two hits as expected, but then Turba starts doing strange things:

conn=368 op=2 SRCH base="uid=iversen,ou=tilsatt,dc=hio,dc=no" scope=0 filter="(?=undefined)" 
conn=368 op=2 SEARCH RESULT tag=101 err=0 nentries=0 text= 
get_filter: unknown filter type=48 
conn=368 op=3 SRCH base="uid=beriti,ou=tilsatt,dc=hio,dc=no" scope=0 filter="(?=undefined)" 
conn=368 op=3 SEARCH RESULT tag=101 err=0 nentries=0 text= 
conn=368 op=4 UNBIND 
conn=368 fd=291 closed 

Why does it try to do this? All the information needed was returned in the 
first search anyway.

On the screen there are just no hits displayed.

Any ideas?

-psi