I upgraded my site from Magento 1.7 to 1.8 but the onepage checkout is not working.I can never go to shipping method step.the continue button does nothing. I tried by modifying info.phtml and payment.phtml but no success. I have gone through the previous answers of same question and i tried everything. So THIS IS NOT A DUPLICATE QUESTION.
Please check the file
app/design/frontend/your package/ your theme / template/checkout/onepage/shipping_method.phtml and check if the id
checkout-shipping-method-load exists. if not, please update the file with the new version. Additionally you may also check all the checkout related files if their codes are updated.