The comments section of some of my blogs do not show up. When I change the comments settings to "Pop-up window", it works - but when it is "Embedded below post" it doesn't work!
The comment form code is part of the post template. When you publish a new post, any changes currently active in the post template will become part of your blog. It appears that Blogger recently changed the post template code - though whether permanently or temporarily, we cannot say.
If your blog uses the inline comment form, and your recently published posts now lack the comment form, you may see an improvement by refreshing or repairing the post template - then clearing browser cache, and restarting the browser. If that gives you no improvement, then change the blog to use a full page or pop-up window form, until Blogger can fix the problem properly.