Gui visible property is true but it does not show up? - Answered

So I have a script that makes a GUI visible. local block = script.Parent

while wait() do
	if script.Parent.Size.Y > 8 then
		local selectionBox = Instance.new("SelectionBox")
        selectionBox.Adornee = block
        selectionBox.Color3 = Color3.new(1,0,0)
        selectionBox.Parent = block
        local d = game.StarterGui.ScreenGui.Frame
        d.Visible = true
        wait(2)
        d.Visible = false
end
	end

The GUI was not showing up so I checked it's properties and sure enough, it was true, however it did not appear on my screen. How can I fix this? Thanks.