This is a serious bug since Vodafone is the second biggest Italian cell carrier. To see the bug, you have to: 1 - Enter your username and password 2 - Click on any link You get immediately logged out, so you can't access the shop and do-it-yourself sections of the site. This bug affects all versions of WebKit. Gecko-based browsers work correctly.
This is a duplicate of Bug 7738. See also Bug 9893 and Bug 3512. This bug can't be fixed in WebKit, it must be fixed in the "Foundation" classes in Mac OS X that handle HTTP requests and cookies. Apple is aware of this bug (see Bug 3512; rdar://problem/4110617), and it will hopefully be fixed in Leopard (Mac OS X 10.5). *** This bug has been marked as a duplicate of 7738 ***