Board won't function on my 2009 iMac

The board disappears as I move my cursor over it and blips back and forth and doesn’t register all the pieces on the board. I can refresh the browser but as soon as I move my cursor over it again or my opponent makes a move, the same thing happens again.

What is your specific browser and OS version? Did this problem only just recently start for this machine? Or has it always not worked properly?

It is possible that the available software from that machine might be too old and out-of-date to properly display given the current technologies used to draw the board.

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