MDB2 Error: constraint violation (-3): _doQuery: [Error message: Could not execute st

[sni]

Hi Guys

my config:
PHP 5.3.8 (cli)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection
Server version: 5.5.16-log Source distribution

Apache/2.2.21 (Linux/SUSE)

I recently migrated to opensuse 12.1 and i cant login anymore. In the browser i got the message "your session is invalid or expired" . i completely reinstall everything but also during the installation i gor a weird MDB2 connection error. The error log shows the message below.

[Native message: Duplicate entry 'cmvavlu6g45nondfahs7od5cuusnt1hi051p3gr8' for key 'PRIMARY']

[18-Nov-2011 23:07:34 +0100]: DB Error: MDB2 Error: constraint violation Query: _doQuery: [Error message: Could not execute statement] [Last executed query: EXECUTE mdb2_statement_mysql_274f1c4e391963b5851b6cfdb3e46cb0e8b4476c0 USING @0, @1, @2] [Native code: 1062] [Native message: Duplicate entry 'cmvavlu6g45nondfahs7od5cuusnt1hi051p3gr8' for key 'PRIMARY']  in /srv/www/htdocs/rcwebmail/program/include/rcube_mdb2.php on line 708 (GET /rcwebmail/?_task=mail)

Can anybody help me on this? I tried already the 0.7 beta but unfortunately with the same error. I'm also not sure if the problem belongs to the OS binary's or to roundcube.

Thanks for your help
Jörg