For those who have tried to post comments this morning and received the following message:
Comment Submission Error
Your comment submission failed for the following reasons:
You are not allowed to add comments.
You have not been banned. The problem, which we are looking into, appears to have blocked all comments since a little after 10:00 a.m. Eastern Time.
We apologize for the inconvenience and will update with more information when we have it.
The bug has been solved and our comments feature is back and running.