New problems with IE(8), editor and Turn Editing On button caused by some recent change

Something strange is going on again in moodle 2 latest version (CVS)

When you press Turn editing on button IE8 launches an error and developer tools tell that in loader-min.js object does not support method or property - and highlights

W.id=W.id||I.guid();

This happens only with button, not with Turn editing on link.

When you try to edit some section summary you don't get the editor and IE8 developer tools stop in that same file and

K.id=K.id||E.guid();

If you turn IE8 to IE7 mode the error, 'this._form' is null or not an object, comes from address like javascript.php?file=%2Flib%2Fform%2Fform.js&rev=156

and there line

this._form.get('elements').each(function(){if(this.getAttribute('name')==name){elements.push(this);}})