In recent updates we have made changes to how images are stored on our servers. This change was implemented in version 1.2.7. If you notice when you open the Builder and navigate to a page that images are not appearing within the UI you will need to re-drag those images from the right pane to the widget within the UI.
This will only be an issue for older projects that have not been opened since the release of v1.2.7. If you have been accessing your UI and making changes this should not be an issue.