Originally Posted by Ian
I don't think so, Pops - the more I think about it the more I suspect the memory difference is the key to this. The pano is composed of 14 vertical format donor images, all of them RAW files too. That's nearly 700MB of uncompressed data in 8-bit form. The stitching process may need a lot more memory than that.
I feel it can't be lack of memory, I have stitched even bigger pano's than you are talking about here (over a gig) with 4 gig of RAM it simply took a time to do.
That said I rarely use Photoshop I use PTui.
A few years ago i had an odd experience, I did a pano in PTui and one part would not stitch correctly, but it did in Photoshop, the reverse has been the case on other occasions. It my be worth checking out other stitching programes to see how they workout, would make an interesting exorcise.