Have WP 3.9 have tested with four+ different themes including default 2014 (others are 2 child themes and regular themes 2011, 2012 and Pico light). I have deleted all plugins except Askimet. I am currently working with default 2014 theme.
Seems when using editor on a page in visual mode, you can create a new paragraph and then go to text mode work and it saves it just fine.
But if you have a table, that has paragraphs, if you go work on it in text more to add code, save it or go back to visual mode, it is stripping the paragraphs and running the items together. You don't even have to go to the text mode. It saves it and strips the paragraphs. It is the tables in all of these that seems to be the difference.
I have added different plugins that work on the editor to see if I can get the paragraphs to stay and nothing so far has worked. Even the images in the tables are not behaving. So defined my own css for the images to make them stable.
BTW was working great in 3.8 with ultimate tinyMCE then it got upgraded. Bummer. Then deleted pages and started again thinking that was the problem. This version of WP seems to be running sketchy for me.
Also, it would be nice to have <p> tags stay if you define them or at least be given a choice. Just throwing that in.
page with problems:
page view image:
admin visual view:
admin text view of code:
Maybe someone else is having a problem with tables and paragraphs. I have other jobs and right now I don't want to upgrade them.