4.8 p4 blackscreen / black area problem

oh…my…god…
this is not crash on specify project, this is editor level crash. crash on the way to show project browser window.

Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffff

UE4Editor-ShaderCore.dll!FShader::SerializeBase() {0x00007ff986ecff73} + 3 bytes [e:\github\unrealengine\engine\source\runtime\shadercore\priva
UE4Editor-ShaderCore.dll!FShaderType::Initialize() {0x00007ff986eb6848} + 0 bytes [e:\github\unrealengine\engine\source\runtime\shadercore\priva
UE4Editor-ShaderCore.dll!InitializeShaderTypes() {0x00007ff986eb7024} + 0 bytes [e:\github\unrealengine\engine\source\runtime\shadercore\priva
UE4Editor.exe!FEngineLoop::PreInit() {0x00007ff65a46af5a} + 0 bytes [e:\github\unrealengine\engine\source\runtime\launch\private\l
UE4Editor.exe!GuardedMain() {0x00007ff65a46240b} + 15 bytes [e:\github\unrealengine\engine\source\runtime\launch\private\l
UE4Editor.exe!GuardedMainWrapper() {0x00007ff65a462a5a} + 5 bytes [e:\github\unrealengine\engine\source\runtime\launch\private\w
UE4Editor.exe!WinMain() {0x00007ff65a4745d9} + 17 bytes [e:\github\unrealengine\engine\source\runtime\launch\private\w
UE4Editor.exe!__tmainCRTStartup() {0x00007ff65a4755c9} + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
KERNEL32.DLL {0x00007ff99a8f15dd} + 0 bytes
ntdll.dll {0x00007ff99d0243d1} + 0 bytes
ntdll.dll {0x00007ff99d0243d1} + 0 bytes