Could someone from Epic explain in more detail what was changed in the physics.
In the project settings there is now PCM, share async etc, and also in the rigid body details tab is async as an option now
Obviously some major changes were done beyond what is mentioned in the release notes.
Are you trying to multi-thread PhysX 3.3 with UE4.8?
All my projects that I worked on for 4 months now since 4.6 are not working anymore because constraint linear limits are ignored and attached bodies shift, even though linear limits are locked. Also forces are largely different and physics are overall more jittery.
These observations are from straight conversions to 4.8 and the last version was 4.7.4.
Everything worked fine in 4.6 and 4.7 and with the new physics changes in 4.8, my work of 4 months is suddenly unusable.