Paragraphs Not Separating when Posting.

I recently tried posting on my blog and all paragraphs, though originally separated, when Previewed, they all ran together. All spaces were removed from between all paragraphs. I tried posting and the same thing happened. Even though all looks well in the post before Preview or posting, it will not post with proper spaces between paragraphs. Anybody seen the same issues since updating to the newest WP. Any ideas to there?