CMS Wrong time zone for unregistered users
 

Hi everyone,
after upgrading to vBulletin 4, I noticed a little issue.

The default timezone of my site is: GMT +1
Every new registered user, get correctly this option as default value.

So, every registered user correctly see date/time in GMT +1

The strange thing is that unregistered users get everytime GMT + 2, I also tested this issue while logging out (and I became an unregistered user to vBulletin's eyes).

Any hints?