Thanks for the information, the power button works for me, at lease, for off as I use a CEC Adapter from Pulse-Eight in an Intel NUC.
I think I'll rollback to the previous version too. As well as the problem with the remote there is another problem with the video not filling the screen correctly.
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At the end of the log I was using
DEBUG: CPythonInvoker(12, /storage/.kodi/addons/script.keymap/main.py): instantiating addon using automatically obtained id of "script.keymap" dependent on version 2.19.0 of the xbmc.python api
It is hard to see that I was pressing the coloured buttons as they don't generate any events.
We have been using a Zotac MCE remote without any problems but after updating to LibreELEC 9.2 the colour, Windows and Clear buttons no longer generate events.
We used the keymap editor to change a few keys but now these keys just time out.