Hi @supernov,
Probably, this is an error in the complex model regression, where the regression keeps iterating and so seems to be stuck… My guess would be that between your subs you have very little difference in Field Of View? So all images have more or less the same Field of View? What amount of dither do you apply? If this is only a couple of pixels, then I would advise to use more aggresive dithering. this will improve the distortion correction as well.
Anyway, If you send me those 11×15 min sub, I’ll try to fix this error ? probably you are triggering some exception in the complex multiple view regression algorithm.