To start with, I am amazed that any web developer would roll out such a larger iteration during the heart of the day. But that aside, I have had to install a new browser to post.
Mac, Mavericks, latest Safari [updated yesterday] and the boards are not useable. Can't start a Discussion, CSS doesn't render correctly at all, and navigating to read a post is hit or miss.
Here is a screen shot of what this page looks like in Safari. [And I even restarted my browser before taking this shot.]
I am using Firefox to post.