Can't load my map after restarting world editor

[Brother_Clovis 0]

I have to be doing something wrong here.   I started building a new terrain, everything looked pretty good, had a few layers setup, lighting and stuff.  I save it, come back a few hours later to keep working.  I open the world editor, and select file/ load world, and select my map.   All of the things I created earlier that were in my hierarchy are now gone.  They are still in the resource browser, but I can't add them back to the hierarchy.   My viewport is just solid white, and there is no gizmo in the top right corner.  

I've restarted this map 3 times now.  I have to be doing something wrong.   Why do I keep losing my progress?   
 

[DEADSCAPE 1]

Having same issue would love a fix too!