Ability to see or post comments has disappeared

For the first time, ever, my readers’ ability to post comments on my blog, PoorMansFeast.com, has disappeared. I am running Thesis on www.remarpro.com. I received one comment on my most recent post, and then….nothing, and was alerted by a reader via email today that the ability to post is gone.
Can someone help?
Thanks.
Elissa Altman