Finally worked out what was wrong. I use LMS with Material Skin and this has been changed so that you need the full path in the browser to point to the web page. instead of using http://<IP>:9000 you now need http://<IP>:9000/material/?page=now-playing
This is explained on the authors GitHub page https://github.com/CDrummond/lms-material/wiki/01-Introduction
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