I am experiencing the same thing, but only in Internet Explorer 11, which I got when I installed Windows 8.1 the other day.  When I view the HTML source of the page, I see that the Cute Editor window is being rendered as a plain textarea.  It is still rendering normally in Firefox and Chrome.

I have another component on my site that is also behaving unusually, so there must be some capability that is turned off by default in IE 11.  Javascript ("active scripting") is enabled, so it's not that.  What, exactly, is Cute Editor looking for when it decides whether to render the editor normally or as a plain textarea?