viewport lighting suddenly gone dark!?

Development Rendering
1

Recently when loading up my scene suddenly my entire viewport turned up very dark. (4.10.4)

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Strangely when pressing PIE or VR Preview everything is lit fine, though when editing my viewport has become near unusable except for when set to unlit, though that doesnt help when trying to finetune lighting.

Is there something that can trigger this? and is there a way to fix this?

I have checked post process volumes, cameras and viewport settings but everything is set up correctly and varying them doesnt yield results

2

Have you checked the quality settings? I know the lower levels affect the light details alot

3

ah thanks, yes for some reason the scalability settings for post processing between medium and high caused this error.
However i have no clue why this would even be possible as having your viewport in the medium setting just renders it unusable for no apparent reason.