SOLVED (for me at least)!
I went back today and made another attempt to track this down. My crash was happening when a drop-down menu was opened for any Skeletal Mesh or Geometry Collection variable. Here’s what I did:
- Followed the previous advice in this thread and disabled Ray Tracing and GPU Compute Skin Cache
- I was now able to open the drop down and noticed that along with my skeletal meshes were included a number of old Physx Destructible Meshes which are no longer supported by unreal
- I deleted those Destructible Meshes from my project
- Re-enabled Ray-Tracing and GPU Compute Skin Cahce
- No more crashes!
So in my case, the crash was being caused by the existence of Destructible Meshes in the project. These have now been replaced with Geometry Collections. This explains why it wasn’t a common issue, since those started being phased out ages ago.