I am also getting this bug at my game’s development place: Testing - Roblox
I am on Windows 7, the bug never happens in studio, only while playing. Game is streaming enabled and has a large amount of terrain, though terrain is not placed or removed through scripts at all when playing. Also seems to be tied to the camera angle for me (if I have my character sit still it will stay as either empty or normal and I can go back and forth between the two by slightly moving the camera)
I also get a lot of these errors in the above game: Errors in console: BlackFrame is not a valid member of ScreenGui - #12 by TheRings0fSaturn
Not sure if the two could be related