Magento

This is strange. For some reason, validation is breaking submit buttons. For example, hitting the subscribe button before entering an email into the newsletter sign-up will trigger the validation feedback, but then the subscribe button will not work after entering a valid email. The same goes for adding a configurable product to cart before selecting an option. After getting the validation warning, the add to cart button stops working. Any ideas?

It might be when updated scriptaculous/effects.js to the latest version.

page.xml
<action method="addJs"><script>scriptaculous/effects.js</script></action>

possible conflict:
<action method="addJs"><script>scriptaculous/effects-1.9.0.js</script></action> does not interact with the add-to-cart button.

reroll and try again. hope it works as it did here!