Fatal Eerror 4.14.3 - clearing level

Development Platform & Builds
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Process: In an empty C++ FPS Project (with starter content) - created a new level and imported a heighmap to build a terrain, added a Player Start so I could test scale. All worked fine. As I know of no way to delete a landscape within a level, I created another level without saving and selected discard. Popup appeared stating UE was clearing the level. Then it crashed (see details below).

Do not know if this is reproduceable, or fixed in the 4.15 preview. Onlt happened once, but then only did the above once.

Machine: Windows 10 Pro PC (all updates applied) - i5-6600, 16GB RAM (see DXDIAG.txt for more info).

Fatal error: [File:D:\Build\++UE4+Release-4.14+Compile\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp] [Line: 1882] 
/Temp/Untitled_1.Untitled_1 still around trying to load ../../../Engine/Content/Maps/Templates/Template_Default.umap
 (Object is not currently rooted)



UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_UnrealEd!UEditorEngine::CheckForWorldGCLeaks() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:1882]
UE4Editor_UnrealEd!UEditorEngine::EditorDestroyWorld() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:2013]
UE4Editor_UnrealEd!UEditorEngine::Map_Load() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:2365]
UE4Editor_UnrealEd!UEditorEngine::HandleMapCommand() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:6057]
UE4Editor_UnrealEd!UEditorEngine::Exec() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5538]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\unrealedsrv.cpp:615]
UE4Editor_UnrealEd!FEditorFileUtils::LoadMap() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\filehelpers.cpp:2180]
UE4Editor_LevelEditor!FLevelEditorActionCallbacks::NewLevel() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\leveleditor\private\leveleditoractions.cpp:201]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1018]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:92]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1033]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:993]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\tuple.h:116]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:522]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:275]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:391]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5010]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4999]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5462]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5439]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1652]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2071]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:814]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:678]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:951]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2811]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll[link text][1]
2

Hey Electronik Eel,

So in order to report this as a bug, we will need a way to reproduce it in a new blank project or by using a project you provide to us. I just attempted to repro the crash on my end in a new 4.15 C++ project, but did not get the crash to occur.

Let me know if you have further questions or have new information about the crash to provide.

Thank you,