When I try to render as scene after I have lit it this pop up shows,"Warning!Obscuring the viewpoint during an openGL render may corrupt the final image."If anyone has an answer to this conundrum I would appreciate the info?

It means don't do anything while your doing an OpenGL render.
Bringing another window up in front of the D|S one may cause to rendering to produce unwanted results.
Just sit back once you've cleared the dialog and let it finish.