Well, first of all, you get that warning because the default render setup is in OpenGL.  You can switch to 3Delight by opening your render settings (Render>Render Settings) and dragging the first slider all the way to the right (Software Renderer).  The OpenGL render won't do much more than maybe take the gridlines out of the floor and background (If you don't have a backdrop).  3Delight is a more robust rendering engine ;)  The reason OpenGL gives you that warning is because, obscuring the viewport can, and most likely will, corrupt the image.  I totally recommend rendering in 3Delight rather than OpenGL.  You'll get much better quality, period.
MS

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