Clicking on order submit button does nothing
You have configured OneStepCheckout, added products to the cart and filled out credit card information and the order submit button just won't work.
- Reason behind that issue may be the fact that Terms & Conditions is not configured on your site.
Overview Terms & Conditions settings from System > Configuration > Sales > OneStepCheckout and read the RED note there that explains how to configure this part . Note that you can only use either old settings or Magento terms and conditions at the time. Using OneStepCheckout built in Terms & Conditions is deprecated and using Magento built in Terms & Conditions is suggested.