You're doing what now? Trying to drag an event sheet into a layout?
First off, I can't figure out why you'd want to. Second, when I try it nothing crashes. Nothing happens at all. Likewise, nothing happens when I drag an event sheet from the list into the event sheet editor (though maybe it should create an include? New feature, Ash?)
Or do you mean that you can't reorder event sheets in the project bar? Because that does cause a crash for me.