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If you’re experiencing problem with your checkout (it’s not updating the database and recording the sales order), this is what you’d need to do:

Go to /app/design/frontend/YOURTHEME/default/template
/checkout/onepage/payment.phtml

Change

<fieldset>
 <?php echo $this->getChildHtml('methods') ?>
</fieldset>

To

<fieldset id="checkout-payment-method-load">
    <?php echo $this->getChildHtml('methods') ?>
</fieldset>

 

Go to app/design/frontend/default/YOURTHEME/template
/checkout/onepage/review/info.phtml

Change:


review = new Review('getUrl('checkout/onepage/saveOrder') ?>', 'getUrl('checkout/onepage/success') ?>', $('checkout-agreements'));

To:


getUrl('checkout/onepage/saveOrder', array('form_key' => Mage::getSingleton('core/session')->getFormKey())) ?>', 'getUrl('checkout/onepage/success') ?>', $('checkout-agreements'));

Resource from: stackoverflow.com