Reproduced with: Visual Studio 2017(15.5.1) UE 4.18.1-release Development Editor, Win64 I've built UE by myself without any problem, but if I try to cook a sample project it crashes on: UnrealEngine\Engine\Source\Runtime\Navmesh\Private\Detour\DetourNavMesh.cpp: line 1278 I debugged it and fou…

We’re looking into this internally at Epic and we are able to reproduce. This appears to be a bug in the visual studio compiler update included in 15.5 and we are investigating possible solutions.