New helpers & some existing broken following 2013.6.1

Since updating to 2013.6.1, if I try to create a helper via companion app or web interface, nothing happens after clicking “create helper”.

Selecting any existing input helper, I get the usual context box but when I click on the settings menu, I get the name of the helper as a title bar and nothing else.

Logs are showing nothing related to helpers (I did get a couple of power undervolts following another reboot.)

Anyone else experiencing similar?