Showing HTML codes on bbpress for some users

Hi all,

I really like this theme however have encountered an odd issue when using with bbPress.

For 99% of users, it all works fine, but for a very small number, HTML is showing up as plain code. In particular this is an issue when adding images via a third party plugin called TinyMCE Visual Editor.

The code that shows up looks like:
<img id=”__wp-temp-img-id” src=”image.jpeg” alt=”TEST” width=”800″ height=”600″ />

I know the theme is the issue as I deactivated it and changed to twenty thirteen and it was OK.

If you anyone has any ideas, that would be fantastic!