I agree with Chop and Eric.  Those look like wall coverings.  You can add wall coverings in rooms, walls, or even in your wall defaults.  You will need to look in all those places and remove the wall covering.    Assuming that your refer shows up in your plan view, then it is probably on a layer that is not turned on in your camera view.  Either you accidently turned it off or you switched to a layer set that doesn't have it turned on.  You can figure out what layer the refer is on by