We're compiling a list of fixes on various things that have popped up with new website design.
One problem can't be quickly fixed, but it can be worked around. For some reason, when you go to the comments section on the blog, it doesn't supply the sign-in link. So, if you've been signed off and try to post a comment, you are told you must be signed in but you are not given a way to do it. I discovered that if you click the preview box, it gives you the sign-in link. This is awkward, but for the time being it will have to suffice.
UPDATE: The sign-in bug is fixed.