Cloth simulation doesn't work for particular object I'm trying to follow this tutorial: https://www.youtube.com/watch?v=1bGB-EePxWI
But when I apply the cloth modifier and playback, the object doesn't drop as it generally would
I'm pressing playback in object mode; The simulation works correctly for a new object, but not the one I edited
No pinning. I'm trying to simulate a free-fall
Blender v2.82a
I had the same problem. Took me over half an hour to figure out.
The problem is caused by duplicated vertices.
To fix it switch to edit mode.
Press Alt + H to make sure there is nothing hidden. Then select all vertices A and then press M to merge them by distance.
Have a look at the status bar: 148 vertices removed. Switch back to object mode. Play the simulation. It works again.