Shaders don’t show up at all in the preview window.
What can I do?
I already deleted the Library/metadata folder as suggested online and restarted but it did not fix the issue.
As you can see my scene is completely grey.
Shaders don’t show up at all in the preview window.
Shaders don’t show up at all in the preview window.
Okay i fixed it!
→ Made a completely new project
→ Imported my whole asset folder, luckely I keep everything tidy
→ Scene now showed up, but some of the demo scene light scripts changed so had to replace them because the scripts were broken
→ The subsurface file had to be relinked and all material using the subsurface had to have the mask slider moved to be no longer black.
Weird. But it seems to work now. But if someone has some more insight or something I might be missing, please comment! 
NOOO!
Where have all the particle shaders gone too?
Weirdly all lod distanced seem to have changes to be a bit nearer.