For merging, it's best to keep your camera settings all the same between shots. That's what I like about the Canon photo-stitch mode, is that it keeps the settings the same, so you don't have funky looking pictures... Also, flashes are bad when you're trying to stitch together multiple photos.
Edit: problem solved. photo is up.
Edit Edit: wtf is going on here... first the picture wasn't up, then it was, and now it isn't. Is the picture showing up for anyone else right now?
Edit Edit Edit: It works now, I hope...
Edit Edit Edit Edit: Ok, this is it... No more editing this post, since that seems to be what breaks the photo...