So, I've decided to make a really huge actor. Everything was going well, until I tried to make it walk. Its legs sunk right into the ground. I tried increasing the PushForce. Didn't work. I tried changing the offsets. Didn't work. I tried changing the footgroup to one a little bigger. Didn't work. I tried making an absurd 400-line custom AtomGroup for the FootGroup. Again, Didn't work. The legs move perfectly well on the Actor Viewer, and yet I can't make it walk. I am starting to get desperate. I'm uploading the file here. If anyone finds the problem, let me know. PLEASE.