I had the same problem; also the 'change' event bindings shown in the example won't fire if one changes the numeric value in the text input field (typing 50 instead of sliding to value 50 for example)

Eg. this won't work for keyboard input:

$(":range").change(function(event, value) {
	console.info("value changed to", value);
});

I believe these are bugs, but where to post them?