Hello,
I was going to post my bug but I found this bug : UE-80852 which is probably the same bug (but is not really explicit)
So here is more info on this bug :
UE4 4.23.1
- Create Empty Project
- Create Geometry Sphere
- Tesselation to 5
- Create Static Mesh
- Export to FBX
- Import FBX as Skeletal Mesh
- Open Skeletal Mesh
- Select Section, Create and Apply Cloth, No physic asset
- Cloth paint Left half of the sphere with 1000 value
- New Blueprint from Pawn
- AddComponent SkeletalMesh
- AddComponent Camera
- Move Camera to 0,2000,0 and rotation to 0,0,-90
- Event Tick Add Actor Local Offset (20 000,0,0) * Dt
- Create GameMode Set Default pawn to our pawn and set the game mode into the world
- Play, you should see an “almost” Sphere
- Bring console, set max fps to 20, observe the sphere doesn’t change
- Edit project settings, enable “support Compute SkinCache”
- Restart editor, play
- The sphere is longer
- Set max FPS to 20 with “t.MaxFPS 20” in console
- The sphere is now a long capsule
The problem is that SkinCache is mandatory for Ray Tracing 
I suspect a problem with update order which causes a frame delay of cloth world position
I have attached the test project.
Here is the project:
[link text][1]
