Yes, the comment count is not working properly on blog posts. It rarely advances to reflect a new comment when one is added. It's a pain. Like others, I rely on the count to look for new comments. Problems are greater still on Rock Candy, where posting has been nearly impossible.
We are working on these problems. There's a macro solution in the offing that could be put in place in not much more than two weeks. Fingers crossed here. Sorry for the inconvenience.