Fatal error opening ShooterGame project in 4.18.3

trying to open the shooter game project in release build of UE4 x64 compiled from source via github.
No modifications have been made to either UE4 editor or shootergame project.
Vehiclegame demo works fine.

Exits with Fatal Error. From logs:

[2018.01.23-20.23.30:350][ 0]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0xf89a6290
[2018.01.23-20.23.30:350][ 0]LogWindows: Error:
[2018.01.23-20.23.30:350][ 0]LogWindows: Error: [Callstack] 0x000000007A95ACBA UE4Editor-Navmesh.dll!dtNavMesh::connectClusterLink()
[c:\source\unreal\engine\source\runtime\navmesh\private\detour\detournavmesh.cpp:1278]
[2018.01.23-20.23.30:350][ 0]LogWindows: Error: [Callstack] 0x000000007A95B0A9 UE4Editor-Navmesh.dll!dtNavMesh::connectExtLinks()
[c:\source\unreal\engine\source\runtime\navmesh\private\detour\detournavmesh.cpp:1021]

this is the same error callstack I get when I try try running shootergame via visual studio where it yields an Access Violation trying to edit a member of testlink

I should add I completely wiped all installs / files and started from scratch and the problem repeated itself exactly.

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks

On the rare chance anyone ever finds this relevant:

The issue was resolved up updating Visual Studio