FYI, Will/Chris/TSL Dev:
On the football chat board (which I refer to as "TSL Classic"), I hit the login button, and entered my user name and password. It showed "Welcome, BigDave" in the upper right hand corner of the page, but still had the "Login" button and the message on each thread that said in order to post, I had to log in.
If I hit either of the "Login" links, it just redirected me right back to the page I was on. I resolved the issue by clearing my browser's cookies and then was able to log in.
I am using Firefox on Windows 7.