On line 1165 of htmlArea.php, htmlarea uses the innerHTML property to remove all the child nodes from the status bar. This can cause a run time error in Internet Explorer 7 in some contexts.

Will commit the following fix to HEAD shortly -

1165 this._statusBarTree.innerHTML = HTMLArea.I18N.msg["Path"] + ": ";

replaced by
while(this._statusBarTree.childNodes.length>0)

this._statusBarTree.appendChild(document.createTextNode(HTMLArea.I18N.msg["Path"] + ": "));