Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.64
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-05 13:55, hash: rB806d4fbc5e40
Short description of error
Particle trails are not working in the latest build of Blender 2.8.
If I copy the same object into Blender 2.79, everything is working perfectly.
I think recently the particle system got a patch for better handling of multiple threads and large simulations. May be, some issue with that. @Juan Gea (juang3d)
I have attached the blend file.(Blender 2.8)
Exact steps for others to reproduce the error
Just add a particle system to the default cube and try increasing the trail count.