Here is what a Michael had to say about the white line in my tour:
What I happened to see when I clicked at "Front Porch" view is a white line stretching from the nadir cap up to the zenith. When this happened to me long ago it took me a while to find out about it and it may be true for your workflow as well:
If you use Photoshop (if not, you don't need to read further...) for resizing your image when all the retouching is done, make sure that you don't have an active selection rectangle. Press CTRL+D ("deselect all") before you resize. Otherwise you will notice a 1px wide 50% transparency at the left and right border of your image, resulting in this white line (you can only see it when zooming in to something like 800% or so).