CMS Guests can't view frontpage since PL1 update
 

Hello, I have updated to 4.0.4 PL1 and now guest and registered users can not view front page, they get the tipical screen saying they don't have permissions.

Also, registered users can't go to the forum obtaining same permission error page, they have to disconnect and log again to go to forums.

What's happening?

------
update
------

I have solved the CMS permissions issue selecting "Show section widget" in front page options (in the right). Don't ask me why but this solves this issue :?