Hi Tom,
Thank you, I think I know why. Can you please check this option on your back-end, it should be set to ‘Show the default image’: https://i.imgur.com/xTFtdbr.png
The live loader gets disabled when that option is set to ‘Don’t show that result’. It is mentioned in the description on the ‘show more results’ option, but it is not explained correctly there. A notification should pop-up to inform you when changing these options, but it is not working correctly in the current release (going to be fixed in the next one).
I believe this will solve the issue.