This just started happening in the last few days. The plugin seems to be removing the first and last paragraph from the post when viewing from the front end (but they're still there in the backend). It is this plugin, because I've disabled them all with the exception of Simple Tags. Once I turn it off, the post shows fine. When I turn it back on, the first paragraph and the last paragraph stop showing.
Again, this is just on the front-end. On the back in the post editor it shows the correct content.