[Forum] Problem with forum authentication

[ikaro]

I'm having a strange problem with authentication to vBulletin Forum (ver. 4.1).

I digit user/psw and i login, but the forum do not recognize me immediatly: i need to reload the page to be recognized. I think it's a kind of cookie problem but settings seems all ok.

I don't know where to put my hand on.... the forum is http://www.ikaro.net/forum/

Thanks in advance for any help

Dan

[Zachery]

What happens if you disable ALL of your third party addons (including vbseo) and use the default vBulletin style and language?