On Tue, Apr 20, 2021 at 11:08 AM, Laurent HOUSSAYE wrote:

     7. as 6. plus Weather charts ON : No change in the unsatbility status and charts are all empty. I will try to reload the Chart.js file but I am pretty sure i had the correct one in the SD card root directory. It does not need to be executed or run ? Just put in the SD card and that's a

The OCS reads the "Chart.js" file and sends it to your web browser to run.

I commented on the likely causes already.  I just started from scratch here in that last go around, my development laptop changed so all new libraries/downloads.  Worked fine here should work for you... same hardware + same software = same result.  If the result isn't the same, something is different.