I still experience the same problems as slooude and get the same javascript errors as before updating when viewing the sidebar widgets admin panel:
$w is not defined
Element.CSS_PROPERTIES = $w(
effects.js (line 1046)
$w is not defined
Element.CSS_PROPERTIES = $w(
effects.js (line 1046)
this.element.down is not a function
this.handle = this.element.down('.'+options.handle, 0);
dragdrop.js (line 269)
$(e).down is not a function
$(e).down('.'+options.handle,0) : e;
dragdrop.js (line 687)