Then I don’t understand why it worked so well in one case where the circumstances where pretty much the same. Would be nice to have consistant behaviour. I tried the above example (the one with 4000 images) with less frames, meaning in one try I gave RC every fourth frame, so basically 1000 images and it failed to properly align them. I ended up with about 4 larger and 9 small components, but when I gave it all frames (60FPS) and all 4000 images, it was able to align all of them perfectly on the first try with only one component and with all 4000 images. So I guess it is just a matter of how moody RC is on any given day.