No it's all /bb. I simply edited the URLs a bit for this thread so you don't have my actual site shoved in your face.
I neglected to change the /bb here. Sorry about that. (Fixed)
The chdir command is working because it is calling global.php properly. It's just the URLs to everything on the forced login screen are looking for forum files from outside the forums directory (as stated). eg;
mysite.com/images/gradients/gradient_panel.gif instead of mysite.com/
forums/images/gradients/gradient_panel.gif
and;
mysite.com/login.php instead of mysite.com/
forums/login.php so logging in doesn't work. That's all I need to fix. I've already worked around the images by simply uploading the required ones where they're needed until I find a better method.