I can't see lamps or selection outlines or anything "orange" in 3D view anymore I am very new to Blender and I have no idea what I could have done to cause something like this. I remember messing with the CPU and GPU rendering options. I tried downloading other files from Blender Cloud, and they didn't have the issue. I copied the User Preferences but it's still the same.
The only thing, that can make lamps and outlines disappear is "Only Render" Display option in right panel (the one that appears and disappears when you press N )