This fix is for "Dynamic_force_attribute_selection" Users !
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This is a small change but works correctly for ajax buy now users including me.
Until users don't make this change with Dynamic_force_attribute_selection , ajax buy now will not work correctly.
As I seen on forum, one of the problems for users is to not able to find bug.(for exp. user jake seymour's web-pages)
This bug becomes to users of using Dynamic_force_attribute_selection contribution
Users do not realize that so this change was needed.
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1)Open products_info.php file:

Find: