Comment pagination does not work in post view on blogs with Classic templates. To workaround this issue, click through to the comments form.
For those of you with popular blogs (and lots of comments traffic), your readers will have be unable to view more than 200 comments, if the comments are displayed inline. This effect may involve blogs with Layouts templates too. To workaround the problem, your blog readers can click on the "Post a Comment" link, and view all comments in the separate window.
Until this is sorted by Blogger, you may want to disable inline comment displays, and force your readers to view all comments in a separate / pop-up window.