var r = new CKEDITOR.dom.range(editor.document);
produces this error:
TypeError: Result of expression 'range.startContainer.equals' [undefined] is not a function. range.js:28
Tested in Firefox 3.6.13, Safari 5.0.3, and IE 8.
var r = new CKEDITOR.dom.range(editor.document);
TypeError: Result of expression 'range.startContainer.equals' [undefined] is not a function. range.js:28