Windows 11 - Nothing is happening after I select 'launch in a new window'

On Windows 11, we can install everything fine, steamVR runs and the toolbar app, but when we come to run a selection it just says ‘launching in a new window’ and nothing happens.

You have probably  done a new installation on a  new Windows 11 machine, but during the install chosen the “Local Only” option, whereas you should have chosen the “Remote and Local” option. You just needs to re-install and change this option.