Crash upon attempting preview. 185.0, no changes made.

If I attempt to preview within the dev-kit, it crashes. The version is 185.0. No changes were yet made.

Here is the crash message:

Assertion failed: Bones.IsValidIndex(BoneIndex) [File:F:\UE4\UnrealEngine\Engine\Source\Runtime\Engine\Private\Animation\AnimationRuntime.cpp] [Line: 1302]

KERNELBASE.dll!UnknownFunction (0x000007fefd52b3dd) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x000007fee8e2b594) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x000007fee8d48938) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x000007fee8d148d2) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6c8178c) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cfba40) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cfc491) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cec181) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced2ef) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cebf4e) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced2ef) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cebf4e) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced2ef) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cebbf9) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced2ef) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6cebf4e) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced2ef) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6ced508) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6926cbc) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee694cdaf) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6953310) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6a4e3cb) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6964f3f) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee63a9335) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee63c56e6) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee6acb90b) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee67b4c1f) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x000007fee46514d2) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x000007fee4ab4f86) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f6a9394) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f69ed0e) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f69ed7a) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f6aaa10) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f6ab949) + 0 bytes [UnknownFile:0]
kernel32.dll!UnknownFunction (0x00000000776459cd) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x000000007777b981) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x000000007777b981) + 0 bytes [UnknownFile:0]

Do you have the most recent Binaries from Github?

Yep. Version 185.0

Ensure the level that you are looking at has a Global_PostProcess_Blueprint in the Scene Outliner.