Wasn't sure if you were aware or not, but, the Forums button on the navigation bar links to proboards.com/account/forum and not the forums here on the site. This is very confusing especially to new users as it took me FOREVER to figure out how to create an account and login here.
Yes, we know this. As you can see- the small pop out at the bottom right corner of the forum is gone- that is the replacement. The forum on the site is the Home button as you can tell by there not being a custom home page. The Login and Logout buttons is in the header- not the Nav Bar.