loading 13 images and also a reduced set of 11 images automatically stacks some of the images where the overlapping area is increasing a certain amount. detecting this group leads to 2 panoramas.
in next step unstacking the 11 images and than detecting the group gives a useful result - one panorama
in next step saving this all as autopano project file and the according .pano files (in sum 3 .pano files with 2 tested groups stacked and the one finally with unstacked images...)
closing autopano and reopening autopano and reloading the saved .apw workspace now shows the unstacked group again with partly stacked images. The detected pano in opposite does correct show only one stack and the panorama from before saving.... ... a redetection of the now again stacked images does again give 2 panos ....