@dmlphotography,

I think your forum page is closed for not-registered users. There is no way to open the forum page if you're not logged-in, so there is no way to open the login page as well. Just don't hide the forum page and all will work fine.

Also, this could be a conflict with other plugins, I always recommend deactivate other plugins if something doesn't work. If the issue is fixed, activate them one by one, and you'll find the problem maker.