A couple months back I had this same issue. I tried all sorts of things to fix it, but nothing worked. A couple weeks later my comments started showing up correctly out of the blue again even though I hadn’t changed anything.
2 days ago all my comments started showing up blank again. I haven’t installed any new plugins in months, and it’s been at least 3 weeks since I’ve updated any plugins. I’ve tried everything suggested here as well as clearing my temp files/cache. Nothing has been changed at all. I’ve only added additional posts, but none with any type of coding or embedded content. The comments show up blank to me in both Firefox and Internet Explorer.
Has anyone found a solution to this yet?