texture on sky dome shows in viewport but not in render

I have a scene set up with a cathedral on one layer and a sky dome surrounding the cathedral on another. The sky dome consists of a sphere with a 360 JPG mapped to it (UV spherical). I have the material of the sphere set as emit, 10. I can see the sky through a window of the cathedral in the viewport, but when I render it, the sky has a texture of green lines. I am using Blender internal renderer. I don’t want to use Cycles if possible, because BI is much faster. Any suggestions on how to make this work will be greatly appreciated.