Photoshop CS6 photomerge messes up panorama. Shot in lanscape, comes out portrait.

Question

I have also tried using photomerge in CS5, and the same results occur. I used a stable tripod and made sure that both the camera and the tripod was level.

Answer 1

Yes, it's necessary to do by hand.  The distortion from frame to frame because of the lens requires a lot of ability to "see" the subject material - and there's just not much to be seen.  Add to it the fact that you have some differences in the exposure from frame to frame.
Did you shoot this scene raw?  Did you use the Lens Correction facilities in Camera Raw to reduce the distortion?
I suggest re-converting all the images, making sure the white balance is consistent between them, and of course making sure to convert to 16 bits/channel.  It may not automatically merge even so, but you'll have good data to work with by hand.
You can layer the first and fourth shots in a single document, then align them visually to where a certain part of the bridge is properly lined up, then use a layer mask to effect a smooth transition between them.
-Noel
[Panorama image & PSD File Link removed - OP's Intellectual Property]
Message was edited by: Sudarshan Thiagarajan