I found this on "Blogger Help": "Blogger has removed the URL field for unauthenticated comments. Instead, we're rolling out support for OpenID, a technology for "signing" your comments with your own URL. OpenID lets you comment with the URL you want, while preventing others from impersonating you." This might explain the problems. I have my blog set so that anyone can comment without providing an ID, but Blogger might be having trouble with that.