We pushed out a fairly major update to the backend last night, and we are working out a few kinks.
The most obvious one is that new comments aren't showing up on posts. These new comments exist, but they just aren't being displayed.
We will have everything back in order ASAP.
Update: We rolled back the code. Functionality seems to be back in order, and are evaluating the integrity of the most recent data.
Thanks for your patience!