Magento: Placing Order doesn't redirect to success page

Question

I have a little problem with placing order button on magento. For some reasons when I complete a order and click "Place Order" it doesn't redirect the page in a success page (or even elsewhere) it just stays in the checkout page with all the products still inside (image https://i.sstatic.net/74I3X.png this is what happen when I click the place order button)

I don't really know where to modify the redirect to another page.

This is the code for the /Checkout/controllers/onepagecontroller.php

  /**
 * Order success action
 */
public function successAction()
{
    $session = $this->getOnepage()->getCheckout();
    if (!$session->getLastSuccessQuoteId()) {
        $this->_redirect('checkout/cart');
        return;
    }

    $lastQuoteId = $session->getLastQuoteId();
    $lastOrderId = $session->getLastOrderId();
    $lastRecurringProfiles = $session->getLastRecurringProfileIds();
    if (!$lastQuoteId || (!$lastOrderId && empty($lastRecurringProfiles))) {
        $this->_redirect('checkout/cart');
        return;
    }

    $session->clear();
    $this->loadLayout();
    $this->_initLayoutMessages('checkout/session');
    Mage::dispatchEvent('checkout_onepage_controller_success_action', array('order_ids' => array($lastOrderId)));
    $this->renderLayout();
}

Answer 1

[SOLVED] There was a problem with the file in /public_html/app/code/core/Mage/core/email/template.php (there was a character that stopped the page)

Thank you all guys.