Thank you Adam, this is working a lot better.. however still not perfect :)
* Insert image and smilies result in a "broken image" in the editor. If I look at the html and paste the image path in the browser url it works fine.. I tried both image dialogs (gallery and the other one).
* When inserting a URL the html code looks fine, but it isn't shown correctly like a link in the wysiwyg editor.
Both those issues point to correct html but bugged display in the editor itself. And yes I did a complete refresh (ctrl+f5), many times :)