I see another problem cropped up, I think yesterday, from a new version of the enhanced comment plugin. It looks like there is a version compatibility issue with this plug-in and the version of PHP the site runs on. I’m not sure, but I suspect this has prevented you all from commenting on posts.
I disabled this plug-in, which I forget why was even added in the first place, and everything seems normal to me now. I’ll look at it further when a rainy day comes along. Let me know if you still see any issues.