EXCEPTION_ACCESS_VIOLATION in the UE4Editor-HeadMountedDisplay.dll in Unreal 4.15.1

Anyone been getting the following error with their kits developing in Unreal?

[2017.05.24-22.48.19:859][732]LogWindows:Error: === Critical error: ===

[2017.05.24-22.48.19:859][732]LogWindows:Error:

[2017.05.24-22.48.19:859][732]LogWindows:Error: Fatal error!

[2017.05.24-22.48.19:859][732]LogWindows:Error:

[2017.05.24-22.48.19:859][732]LogWindows:Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffff

[2017.05.24-22.48.19:859][732]LogWindows:Error:

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-HeadMountedDisplay.dll!0x0000000034CB6A15

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-HeadMountedDisplay.dll!0x0000000034CB6B94

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-HeadMountedDisplay.dll!0x0000000034CB6213

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-Renderer.dll!0x0000000013BB81DD

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-Engine.dll!0x0000000016BDEC5A

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-Engine.dll!0x000000001750A74E

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-Engine.dll!0x0000000016BA6096

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor-Engine.dll!0x0000000016BB6785

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor.exe!0x00000000BF7FDEE3

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor.exe!0x00000000BF7EEB40

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor.exe!0x00000000BF7EEBBA

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor.exe!0x00000000BF800A29

[2017.05.24-22.48.19:859][732]LogWindows:Error: UE4Editor.exe!0x00000000BF8022B6

[2017.05.24-22.48.19:859][732]LogWindows:Error: KERNEL32.DLL!0x0000000063D92774

[2017.05.24-22.48.19:859][732]LogWindows:Error: ntdll.dll!0x0000000064190D61

[2017.05.24-22.48.19:859][732]LogWindows:Error:

[2017.05.24-22.48.19:913][732]LogExit: Executing StaticShutdownAfterError

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