The problem is with jquery in IE 7 and 9.
On the product page a select list of product options does not work properly.
To show the select list options requires 2 clicks. One to focus the roll list and the second to show the options.
Occasionaly even the double click will not work.
Chrome, Firefox, IE 8 and other browsers seem to interpret the jquery correctly, and show the roll list options with one click.
The jquery in question is in the add-to-cart-variation.js file.
Line 177: current_attr_select.find('option:gt(0)').attr('disabled', 'disabled');
Tried using focus in but it didnt help.