After upgrading to magento 1.9 from 1.7 continue button not working in checkout. When checking out and selecting the "Checkout as Guest" or Register then clicking the "Continue" button doesn't display the next steps such as the billing, shipping, shipping method forms. The "Continue" button is unresponsive. Same problem with login button. Also When i try to checkout using Google or Facebook social login its move to next step(billing information) but continue button on billing information page does not move to next step. Can anyone help me to sort out the same....
Screen Shot of Checkout Page here http://i.stack.imgur.com/BE5q0.png
You should test using the default checkout process.
Go to your system->config->design and choose the default package and default theme.
The problem is most likely your layout files.
If it still does the samething try changing your package to RWD. This will ensure you don't have any changed template files.