After a Studio update on Friday (October 5th), I started seeing things happening in my game with SurfaceGUIs - they either go completely white or black like on the last image and on the The Turner’s sign(appear as LightInfluence 0, even though it’s set to 1) and in some cases strange shadows or gradients on them. After moving the parts with this issue, it seems as something with shadows is causing the issue. This occurs in both ingame and Studio - it happens when copying the same items into a new game aswell.
All of the SurfaceGUIs pictured below are set to colour 255,255,255 and LightInfluence 1.
The last image on the post is set to LightInfluence 1 but shows as 0 (glowing). I understood that my phrasing was confusing so I edited the post a bit to make it more clear what I’m pointing at.