That’s right. This Visual Composer. The problem is that when you write the content for the first time everything is working properly. At the time when I want to re-edit the page I lose all formatting <“br”> and <p>. I use the plugin recommended by you but it does not help.
I also use this solution: http://www.teslina.com/748/wordpress/qtranslate-code-syntax-bugfix/#sthash.bqDLkwDB.dpbs
This solves the problem for wordpress editor but not in the case edit in visual composer.
