@Dr-Sassi thanks very much! That does seem to have fixed it, and your explanations are very helpful. Time scale is something I hadn't explored before, and I can see how useful it can be. Thanks again!

Hi all,
I'm trying to create a domino simulation but I find that rather than coming to rest once they've fallen, the dominos endlessly slide across one another, desperately seeking the floor. After searching for similar problems online, I've altered every parameter suggested, but nothing solves it. When watching tutorials with a similar approach, the simulations take place very quickly and end abruptly—the trouble is, I want to show a large area of dominos which will probably take a half minute to fall. So Deactivation parameters don't seem to be useful, unless I were to make the clones editable and edit the Timer of each one—yikes! I've created a pared down file with default parameters for the simulation tags. Please let me know if there's anything that can be done, thanks! Domino Animation.c4d