Problem with session files

thank you for your reply. The path are correct and already absloute. 

These are our settings:

  $config['sess_driver'] = 'files';
  $config['sess_cookie_name'] = 'crm_';
  $config['sess_expiration'] = 0;
  $config['sess_save_path'] = '/webroot/temp/webcrm/';
  $config['sess_match_ip'] = FALSE;
  $config['sess_time_to_update'] = 60 * 30;
  $config['sess_regenerate_destroy'] = FALSE;

I may be wrong because I have no knowledge of your file structure, but 'sess_save_path' does not look complete to me. It has to be the complete path from the root of the drive. In a typical Linux setup it would look more like this.

PHP Code:

$config['sess_save_path'] = '/var/www/webroot/temp/webcrm/';