Hi All, I am new to use Relion (1.3) and have some problem with 3D refinement using movie particles. I did 3D refinement using roughly 90k particles, which looks reasonable. But when I tried to continue refinement using movie particles, it stops at "Expanding current model for movie frames...". Nothing happens even after several hours and I am not sure if Relion is still running. Is it because I have too many particles? I am running Relion on a cluster and using 599 cores. Thanks for your help. Wei