[horde] Can't share folders any more

[Tô]

Hi list,

I send my question here because I don't know exactly where my problem 
stands.

Kolab server 2.0.3
Horde 3.2-cvs
Kronolith H3 2.2-cvs
Turba H3 2.2-cvs
Imp H3 4.2-cvs

First of all, I can't access any more (I could before...but before what 
?) to the Imp's option "share folders" : just a blank screen and no message.
This is what I, sometimes, can see in apache's logs :
[Sun Jul 16 10:20:02 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 443
[Sun Jul 16 10:20:20 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 426
[Sun Jul 16 10:20:20 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 443
[Sun Jul 16 10:20:22 2006] [error] PHP Notice:  unserialize(): Argument 
is not a string in 
/kolab/var/kolab/www/horde/kronolith/lib/Kronolith.php on line 338
[Sun Jul 16 10:20:22 2006] [error] PHP Notice:  unserialize(): Argument 
is not a string in 
/kolab/var/kolab/www/horde/kronolith/lib/Kronolith.php on line 338
[Sun Jul 16 10:20:22 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 426
[Sun Jul 16 10:20:22 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 443
[Sun Jul 16 10:20:25 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 426
[Sun Jul 16 10:20:25 2006] [error] PHP Notice:  Undefined offset:  1 in 
/kolab/var/kolab/www/horde/turba/lib/Turba.php on line 443
[Sun Jul 16 10:20:31 2006] [error] PHP Fatal error:  Call to undefined 
function:  str_split() in /kolab/lib/php/Horde/IMAP/ACL/rfc2086.php on 
line 314

I found that somebody had this same problem.
When I echo $shareNames in Turba.php, I see :
Array (
    [0] => localsql:c.cauchois at epfndie.loc
    [1] => c.cauchois at epfndie.loc
)
which seems not to be normal !
The given solution was to wipe out all horde.shares.turba in the 
"horde_datatree" table. So I did it.
But 3 records systematically and automatically reappear, one 
("localsql") whith a child and another with no child or parent.

That's what I think is related to the "undefined offset" error. But what 
about the two others ??

Additionally, I'v got two other problems :
1. I can't see anymore my tasks in my calendar (the option is set and it 
worked before...but before what :-D )
2. I share a calendar (with the rights needed) with another person. He 
can access my calendar, but with no events in it.

I realize theese are many questions at the same time but I suspect all 
is relevant from the first trouble.

I would really appreciate any help,

Thanks in advance,

Christophe