See:
http://www.chess.com/forum/view/community/ie9
There are support issues.
IE 9.0
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Mar 15, 2011
0
#2
Hi everyone,
I have just installed IE 9, and I like its features. I was consiering using this browser, except it does't seem to work with our chess site.
Does anyone know if here is a setting somewhere that I need to enable/disable to get the live chess going in IE or it just wont work.
Thanks in advance.
Cheers,
b3hdad.