On my iPhone, I had to delete the app and reinstall and it started working. You might try that. For the computer, I would try refreshing the browser and everything and see if it resets the scripts that Chessnut uses.
Just suggestions. I don’t know for sure. It helped me though.
Martin
Yes, thank you very much Martin.I had to log off from chessnut app and log on again and it did work out eventually. I guess it is a sort of application reset in order to use the new script.
Try the other way : invert the pieces colors and see
You are right! It did work inverting sides. Good to know we have one more option to use chesscom. Thank you very much for your help 
so it works now? I am having the same issue and it won't work, any ideas?
yeah, i removed the app and it works now
Hi, same issue for me. Does any one have any solution ? I use my Chessnut air with Lichess and no problem at all. I also use a mcbook air M1. It stopped working for no reason...
On my android tablet it's still not working