davidbouche on "Can't loggin"

I've installed WP3, I've just update to 3.0.1 and I've got a pb on login.

I can't login on non-principal website admins.
When I try to login with a good username password the login page reload without any message (when the login or the password are incorrect I've got an error message).

$ uname -a
Linux **** 2.6.27-gandi-2777 #14 SMP Sun Jan 17 19:09:24 CET 2010 i686 GNU/Linux

$ php -v
PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cli) (built: Jan 6 2010 22:41:56)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies