It could be that the Ribbon button was customised - if you press F12 in IE, select the script tab and click 'Start Debugging' do you get any errors in the console when you click the add product button?
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It could be that the Ribbon button was customised - if you press F12 in IE, select the script tab and click 'Start Debugging' do you get any errors in the console when you click the add product button?