Hi,
I was able to reproduce the problem and I saw that the bug is not only an HikaMarket bug, it also happens in HikaShop backend.
The problem is that TinyMCE is initialized two times and Joomla 3.2 does not handle that the editor has been already initialized.
The TinyMCE 4 library does not handle the multiple initialization...
So I want to say that's more a Joomla bug than an HikaShop bug.. But, that's not the problem here.
We can fix it by editing the file "administrator/components/com_hikashop/helper/editor.php".
You have to replace
var $id = 'jform_articletext';
static $cpt = 0;
By
var $id = 'jform_articletext';
static $cpt = 0;
static $initialized = array();
And also replace:
$this->myEditor->initialise();
By
if(!HIKASHOP_J30 || empty(self::$initialized[$this->editor]))
$this->myEditor->initialise();
self::$initialized[$this->editor] = true;
And it will fix the problem in HikaShop backend and in HikaMarket front-end, while editing a product or a category with a WYSIWIG custom field.
Regards,