In the Material Editor, if all Live Previews are turned off, copying and pasting a Material Layer Blend Node will crash when the tool tip is being processed.
Also Reproduced in Main Promotable-CL-2605107
[Link Removed]
RESULTS: CRASH
EXPECTED: NO CRASH
Fatal error! Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000108 UE4Editor-Engine.dll!ConvertToMultilineToolTip()
{0x000007fec9c5c850}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Engine.dll!UMaterialExpressionMaterialFunctionCall::GetConnectorToolTip()
{0x000007fec9c79af9}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-UnrealEd.dll!UMaterialGraphNode::GetPinHoverText()
{0x000007fee4a4bca2}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!SGraphPin::GetTooltipText()
{0x000007fee8abe549}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const __ptr64>::operator()<>()
{0x000007fee893f500}+ 15 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TTupleImpl<TIntegerSequence<> >::ApplyAfter_ExplicitReturnType<FText,TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const __ptr64> >()
{0x000007fee8943789}+ 19 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance<1,SGraphPin,0,FText __cdecl(void)>::Execute()
{0x000007fee8a80e89}+ 36 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!TBaseDelegate<FText>::Execute()
{0x000007feea682a9a}+ 6 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!TAttribute<FText>::Get()
{0x000007feea68afa8}+ 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!SToolTip::IsEmpty()
{0x000007feea780bf2}+ 30 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::UpdateToolTip()
{0x000007feea6eeb81}+ 20 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::ProcessMouseMoveEvent()
{0x000007feea6c8ad8}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::OnMouseMove()
{0x000007feea6b5b51}+ 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage()
{0x000007feeae5d131}+ 10 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::DeferMessage()
{0x000007feeae445c1}+ 74 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::ProcessMessage()
{0x000007feeae5e99f}+ 44 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::AppWndProc()
{0x000007feeae3e1aa}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou USER32.dll
{0x0000000077269bd1}+ 0 bytes USER32.dll
{0x00000000772698da}+ 0 bytes UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages()
{0x000007feeae5fd56}+ 48 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!FEngineLoop::Tick()
{0x000000013f4e3c7a}+ 8 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!GuardedMain()
{0x000000013f4d49cc}+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!GuardedMainWrapper()
{0x000000013f4d4a4a}+ 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!WinMain()
{0x000000013f4e65c9}+ 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!__tmainCRTStartup()
{0x000000013f4e75d9}+ 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618] kernel32.dll
{0x00000000773659ed}+ 0 bytes ntdll.dll
{0x000000007749c541} + 0 bytes ntdll.dll {0x000000007749c541}+ 0 bytes
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-17746 in the post.