4.19.2 crashes after upgrading from 4.17 (crash log/call stack included-maybe shader compiling/directx)

Our 4.17.2 project crashes after upgrading(opening a copy of 4.19.2 version).
Same results if I create an empty 4.19.2 project and migrate 4.17 assets to the project).
I also got message that it failed to convert starter content when upgrading.
The crash report with stack trace appears to be either directx or shader compiling related.
Here I include crash reports of a few incidents.
Does anyone know the issues in 4.19?
Thanks.

Access violation - code c0000005 (first/second chance not available)

UE4Editor_ShaderCore!FShaderId::FShaderId() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\shadercore\private\shader.cpp:794]
UE4Editor_Engine!FMeshMaterialShaderType::FinishCompileShader() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\materials\meshmaterialshader.cpp:136]
UE4Editor_Engine!FMaterialShaderMap::ProcessCompilationResultsForSingleJob() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\materials\materialshader.cpp:1603]
UE4Editor_Engine!FMaterialShaderMap::ProcessCompilationResults() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\materials\materialshader.cpp:1643]
UE4Editor_Engine!FShaderCompilingManager::ProcessCompiledShaderMaps() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:1904]
UE4Editor_Engine!FShaderCompilingManager::ProcessAsyncResults() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:2508]
UE4Editor!FEngineLoop::Tick() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3358]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
UE4Editor!WinMain() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Renderer!FRenderTargetPool::TransitionTargetsWritable() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\postprocess\rendertargetpool.cpp:202]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:554]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenerendering.cpp:2749]
UE4Editor_Renderer!TGraphTask

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Thanks