Does this help? http://home-and-garden.webshots.com/album/578389110wAYXjW?vhost=home-and-garden

The best tip I found from Kaye Wood's site was this: http://inlinethumb05.webshots.com/47...200x200Q85.jpg stitch at a 45% angle starting at about 3/8" before the corner.

The other was this: http://inlinethumb40.webshots.com/47...200x200Q85.jpg those few small stitches help set n stiffen the corner.

Hope it helps, good luck.