It seems that the product variations have a problem after the latest update. On the product page, when you click a variation, the selectors just grey out and do nothing, the variation isn’t selected, and image / prices isn’t displayed.
We’re up-to-date with all plugins, theme’s etc…
I don’t see any JS errors or AJAX calls that fail. But when I switch our theme to wordpress’s native theme all functionality works as expected.
You are running a 2.5 version of our theme and need to update to the latest version 2.9.1 available on themeforest. To update the theme you need download the latest version on ThemeForest -> Downloads. Then just reupload new theme via Appearance -> Themes but install this plugin firstly https://wordpress.org/plugins/easy-theme-and-plugin-upgrades/
Also, we suggest you make a backup of all your files before any update.