No Sun, no sky, no light basically nothing since 0.26

Hi,
Since the new update of 0.26 I'm encountering some very abnormal things going on when spawned into a map. I can see some textures, but there is something very wrong with the lights in general. I can see no sky or equivalent and because of this, there is also nothing else in the sky than dark dark blue / black. I really don't know how to describe this. I think best is to just look at the picture...
I very much hope anyone can fix my problem.

P.S.: I have also reinstalled the game lately and have done cache clearing multiple times. I've also checked the game files multiple times...