When I render the viewport from "View > Viewport Render Image" it appears different and far darker.
Images are darkened in wireframe and solid mode but not in material preview or rendered preview (cycles / evee).
HOWEVER, if any other render passes beside "Combined" is chosen then it then starts to appear darkened if viewport rendered.
Viewport shot here is darkened
Viewport shot in combined mode is completely fine, however, there is no color in the X & Y grid, likely darkened like the rest.
Unsure if this is related to the same problem, but the little preview window in the materials panel has also been darkened.
to clarify, this problem is only happening in this specific blender file. A new blend file does not exhibit any of these problems. Restarting the computer and or blend file does not fix anything, and I am unsure as to when this started happening.