CI fails to create session

[eluser]zsela[/eluser]
This is pretty weird. I downloaded and installed an unspoilt package of CodeIgniter (version 2.1) and made the minimal settings to run the system, and the problem is still reproducible: every time I load the welcome page in Chrome a new record is created in the session table, but not when loaded with Firefox.

The changes I made:
- set the base_url and encryption key and modified the session table name and enabled database storage for sessions in the config.php
- in autoload.php added session library to the list of automatically loaded libraries
- filled in the database info in database.php

I am out of ideas now...