It does seem to be a bug.

Thanks for your help.

Thanks, but that is not the problem.

The three camera focus buttons in the viewport are disabled, no matter what else I change in the camera set-up. The problem exists regardless of whether or not perspective is enabled.

I only have this problem in one scene. I have other scenes where the buttons ...

I can't work out how to activate the button for camera autofocus in the render viewport.

Can anyone help?

Apart from the rendering...

The toilet and sink would be better if you swapped their positions. Normally, a toilet would not have a window behind it - could cause some embarrassment! Also, as it is the sink drawer would create a hazard when opened next to a doorway.

Just bought the plug-in for DS, and had the exact same problem.

Fixed now by using the installer link here: http://render.otoy.com/forum/viewtopic.php?f=44&t=44044