After we switched over to assets.agi.com for stk-terrain tiles, all worked very well to correct our 'space with stars' issue. Many thanks for pointing that out.
Now, we're seeing an issue with Bing Maps, which is our default load with STK world Terrain meshes.
If you load our site at startup, http://paperdrone.com, we get that space with stars issues we saw below.
But if we switch over to any other, such as ESRI World Imagery for instance, (using the Maps button upper left) all is fine.
Has anyone seen this issue?