We've had a problem here for quite some time with the interaction between the Now Smell This log in procedures and the browser caching functions. If you log in and get back to the main page and it still says "Login to comment" at the top, don't worry, you are in fact logged in, and when you open an individual article to comment, you shouldn't have any trouble. If you want to see for sure, all you need to do is press CTRL + F5 to refresh the page — then you should see the "Welcome, whomever" notice at the top left.
I am trying to fix it, I'm just not very good at it, obviously! If you're having any other trouble using the blog, do comment here or on the New Look post.