[imp] unserialize() failed in Tree.php

[Akom]

Hello all,

I've installed all up to date CVS code in an attempt to cure this error (I had 
3.0 and 3.1 releases out of rpms before), but it still seems to occur:

Notice:  unserialize() failed at offset 5 of 50 bytes 
in /var/www/htmls/horde/imp/lib/Tree.php on line 413

(here are my contents:)
--------------
    411         $serialized = $prefs->getValue('expanded_folders');
    412         if ($serialized) {
    413             $expanded = unserialize($serialized);
    414         } else {
    415             $expanded = array();
    416         }  
---------------

This is the content of my expanded_folders cell in the table:
a:1:{s:30:"{localhost:143/imap/notls}mail";b:1;}

I get this on the folders page, and it seems to preclude folders other than 
INBOX from getting checked for new mail.  This doesn't always happen though, 
which makes it so the more annoying.  Pretty much every time I change something 
in my mysql db, everything starts to work fine, but after some time/some number 
of logins, this will begin to occur.  After some time I've had it go back to 
normal again, but I cannot figure out what it coincides with.

Another thing which seems to coincide 100% with this occurence is the loss of 
identities (except default).  Everything is still in the tables, but the app 
will not show them.

I've verified that at the rare times when everything does work, the contents of 
the table horde_prefs, specifically the "expand_folders" item is the same as 
when it doesn't work.  

In addition to installing everything completely fresh out of CVS, I created all 
new tables from scratch with the schemas out of CVS as well.  The behavior was 
unchanged from my experiences with 3.0 and 3.1 (Except I started getting some 
Auth.php errors (also unserialize I think) which I worked around by setting 
logging to none in that file since everything else works fine)

I am now unsure about what else I can provide, but I am starting to wonder 
whether this could be a php or mysql issue...  However, I've upgraded from 
Mandrake 8.1 to 8.2 and now it is a clean install of Mandrake 9.0 beta and 
clearly both php and mysql have changed. 

Any help would be appreaciated, or let me know what else I can provide,

Akom

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