Terrain 401 with old CesiumJS version

Hi I am just wondering if there is a known problem with using the “Cesium World Terrain” when using an older version of Cesium. It seems that every time Cesium gets an update, when clicking the world terrain link in the imagery/terrain menu, it just goes black.

Also I download the Cesium files and use them locally in my project to run the app in offline mode (obviously the streaming doesn’t work in this instance), so i can’t just link to the online libraries when Cesium gets updates.