Hello, Yesterday I started to do my first assignment in Analysis which worked fine. But today I could not assign any more since there are no atoms in the atom browser sheet (see screenshot). This problem doesn't disappear after restarting the program and it only affects one of the molecular systems. Creating a new molecular system works fine and this has atoms in the atom browser. Any suggestions? Lena Kask Dr Lena Kask BioNMRUnit Edinburgh University