Things change between versions obviously 
I’m not sure which settings exactly might have caused , might investigate at some point… for now just try to copy over everything from the example map.
Edit: actually it’s the SSS light vector parameter which is fed by the BP_Skydome.
If you want to use your own sky then you will have to manually set the light vector yourself.
Check out the UpdateSun function inside BP_Skydome (to the right) to see how it is done… you can also set it to a static direction if you have static sun.