I have a Magento site that is still running on version 1.4. We have not made any upgrades or changes to it but the checkout process has stopped working. When you click on checkout, you get to the page but all the steps are "closed". When I manually with the CSS set display:block, the first step will show but the buttons don't work to login. I'm thinking the jQuery has maybe stopped working.
Can anyone perhaps assist with this? The site is www.modelrailroad.co.za