I almost wanted to ask the question again, because from reading this thread it doesn’t seem resolved.
I tried what Tosh said in his last reply though, and it worked! 🙂
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Please try adding this to your wp_config.php file or modifying it if it already exists.
define(‘WP_MEMORY_LIMIT’, ‘128M’);
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I think I found a solution for this problem. I downloaded the most popular MCE at the moment: TinyMCE Advanced (http://ww.wp.xz.cn/extend/plugins/tinymce-advanced/)
Inside the options, at the bottom of the page, there’s a box that says “Stop removing the <p> and <br tags when saving and show them in the HTML editor”
I haven’t tested it extensively yet, but so far it has worked.
If you haven’t found the solution by yourself yet, I hope this helps!