Sat Jun 18, 2011 10:50 am by lax
What you're seeing is based on the difference between your Window Layout's actual resolution, and the aspect ratio of what WoW has configured as its resolution. You do not have a wide screen resolution selected in the game, therefore border at the login screen.
The usual fix is to Export to Inner Space and allow ISBoxer to match the resolution in Config.WTF to your Window Layout by clicking yes.
There are times when ISBoxer will not offer to fix this, e.g. when there is another problem when Exporting that causes it to abort, or when you have Window Layouts with different resolutions assigned to the same Character. In other words, if you have a Window Layout that's full screen stacked, and one like this at the bottom, assigned to two different Character Sets with the same Characters in them, ISBoxer can't sync the Config.WTF to the ideal resolution... because there's two ideal resolutions.
Edit: wait what, you want that border?