Ooo... I'm not familiar with Macs. The calculators are in Macromedia Flash. Do you have the latest Macromedia Flash or Shockwave Players installed? Minimum version required for the Calculators is Flash Player is 7.0.
You can go to http://www.macromedia.com/downloads/ to get the latest players.
Meanwhile, I'll check with the Macs in my office.
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