tinyMCE and IE7 - all buttons disappeared, no textarea border

I've had tinyMCE working for me for a while on my site, but now in IE7, when I try and edit a node, the body field no longer has any buttons and the textarea has no border. It still works fine in FF and Safari though. I haven't updated this module. The only changes I've made are to change languages on my site. But even when I switch back to the original language it's not working. I've attached a screenshot.