When i disable tinyMce, i got
I don't know why...
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The problem (most probably) is that you field is named
This means it will get the html id
content in the dom.
But there is already an element with this id. It's the page container.
You can either change the name of your field or add a prefix to all ids of the form elements.
In the tab class that generates the form add this line:
anywhere in the code before calling
$this->setForm($form) and after calling
$form = .....
Use the cms page admin as example. The page also contains a field called
content, but the problem does not reproduce there because it is handled as I explained. See the core code as reference