No you misunderstand what I'm saying. As soon as I switch to the camera view all the grass vanishes - it doesn't render (the scene isn't black) and can no longer be selected. Until then rendering a perspective view worked fine. If I change the limit visibility to on prior to selecting the cameras view, I can see it works as it should with grass inside the cone of visibility appearing or being hidden according to how I change the Expand parameter. Once the grass vanishes, the grass only reappears if the camera is deleted.
Screen capture attached showing what's happening.