There was indeed some weird behavior with Hevedy’s port of TegLegs project. I couldn’t reproduce the same behavior when I ported this myself into 4.14 but tested and verified it indeed breaking with Hevedy’s 4.14 port.
However, important thing here is to realize that the core issue is NOT related to this project but to some physx / UE4 oddity since 4.14. It could be related to some data corruption when upgrading the files from previous engine version into 4.14+ as well (which would explain why it broke for Hevedy but not for me). I’ve also seen this kinds of freezing on completely different physx simulated UE4 project.