Did anyone find a solution to this?
I have edited /cms/_config.php and changed the section with
to have 'valid_elements' => "* [ *"
This did not work. And I also tried to use all the options as stated by TinyMCE for Full XHTML rule set.
This does not appear to work in Version 2.3.6. but apparently used to work in LeftandMain in early versions of 2.3.
Is there a possible bug in 2.3.6 for this?
Or am I looking in the wrong area?