Nice to hear it worked.
I'm not familiar with OpenGL but the problem seems to be that with the second GraphicsInit() the previous setup gets lost but isn't freed up properly as the graphics are never finished correctly, so some objects and settings still reside in the memory and interfere the rendering.
By the way, the first GraphicsInit() (at OnInit()) isn't necessary if you're anyways reinitializing the graphics in the Render method.
I'm not familiar with OpenGL but the problem seems to be that with the second GraphicsInit() the previous setup gets lost but isn't freed up properly as the graphics are never finished correctly, so some objects and settings still reside in the memory and interfere the rendering.
By the way, the first GraphicsInit() (at OnInit()) isn't necessary if you're anyways reinitializing the graphics in the Render method.