Kinetic Turtlebot Teleop not working in Gazebo 9

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On Ubuntu 16.04 & Kinetic, I updated Gazebo from 7 to 9 to fix another issue.

Now I find that Turtlebot teleop doesn't work when I launch the Gazebo demo (although the robot and world load).
But teleop does work within the Stage demo.

I can also see that the teleop node is broadcasting messages, and those messages are being remapped to where they should go.

So I'm not sure if it's really teleop, or if it is perhaps the base controller (or something else?) that's not working in Gazebo.

Is there any reasonable (quick) fix to get this working?