Undo and redo in TLF

[jude]

Does undo and more importantly redo work for everyone else? I'm using 4.15
with this code:

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009";
                       xmlns:s="library://ns.adobe.com/flex/spark"
                       xmlns:mx="library://ns.adobe.com/flex/mx">

    <s:TextInput horizontalCenter="0" top="10" />
    <s:TextArea horizontalCenter="0" verticalCenter="0" />
</s:WindowedApplication>

Undo seems to work but not redo.

I'm running OSX 10.11 and AIR 20.