I ran into this same issue in 4.14 also when running low frame rates. I was using a small number of CPU particles as hidden tracers for my GPU particle effect to register collisions. In performance section that is indicated by Eric, I found it was also necessary to uncheck the “Drop Detail” box. When this was checked, at low frame rates, tracer particles would just pass through my static meshes. Once unchecked, my collisions would work correctly even at minimum fixed frame rate of 15 fps.
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