Bug found:

From the viewHomeInOverlay.html file:

activateCameraSwitchKey: true, /* Switch between top view / virtual visit with space bar if not false or missing */

You can leave out or set the activateCameraSwitchKey parameter to false but it doesn't do anything. The space bar still switches to the virtual visit, which I do not want in my case. There are no camera's apart from the default observerCamera and topCamera. This problem was already present in the previous versions.
(My overlay views are just one or two models in an otherwise empty space. There's nowhere to go with a virtual visit.)

This is the onclick code I have in my web page: