I have found PTGUI to be finicky at time w/o knowing why but when it works, it works well.
Other programs do the same thing (finicky for no visible reason) that is why I use a couple and even try them them all, even if the stitch is initially acceptable IF that panorama is worth the time.
If of interest and if not known, PTGui has its own Google forum that provides help with finicky issues. Questions are answered quickly and understandably.
If of interest and if not known, PTGui has its own Google forum that provides help with finicky issues. Questions are answered quickly and understandably.