Paragraphs

I have been fighting with Blogger for the last 40 minutes and it's still refusing to put my paragraph breaks into the last (long) section of the previous post. They're there in the edit window, but not when I publis. I realise this makes the post difficult to read, and apologise. Short of throwing the laptop out of the window I'm at a loss at what to try next! If anyone has any advice it would be appreciated. Thanks!