Project Crashes on Startup 4.14

Hi,
After trying to import a jpg file that was expectantly too large, 14000 x 14000. UE4 crashed and has not been able to startup without crashing. I have attached the log file and crash diag.

MachineId:86A6AFF04B0B3A86F91AD49AE4413C98
EpicAccountId:

Fatal error: [File:D:\Build++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp] [Line: 1634]
Failed to compile default material WorldGridMaterial!

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_Engine!FMaterial::CacheShaders() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\materialshared.cpp:1634]
UE4Editor_Engine!FMaterial::CacheShaders() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\materialshared.cpp:1518]
UE4Editor_Engine!UMaterial::CacheShadersForResources() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\material.cpp:2131]
UE4Editor_Engine!UMaterial::CacheResourceShadersForRendering() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\material.cpp:2049]
UE4Editor_Engine!UMaterial::PostLoad() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\material.cpp:2708]
UE4Editor_CoreUObject!UObject::ConditionalPostLoad() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:832]
UE4Editor_Engine!UMaterialInterface::PostLoadDefaultMaterials() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\material.cpp:403]
UE4Editor_Engine!UMaterial::PostLoad() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\materials\material.cpp:2522]
UE4Editor_CoreUObject!UObject::ConditionalPostLoad() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:832]
UE4Editor_CoreUObject!EndLoad() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1590]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1281]
UE4Editor_CoreUObject!LoadPackage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1437]
UE4Editor_CoreUObject!ResolveName() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:722]
UE4Editor_CoreUObject!StaticLoadObjectInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:809]
UE4Editor_CoreUObject!StaticLoadObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:869]
UE4Editor_UMG!ConstructorHelpersInternal::FindOrLoadObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\public\uobject\constructorhelpers.h:31]
UE4Editor_UMG!UWidgetComponent::UWidgetComponent() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\umg\private\components\widgetcomponent.cpp:312]
UE4Editor_CoreUObject!UClass::CreateDefaultObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:2664]
UE4Editor_CoreUObject!UObjectLoadAllCompiledInDefaultProperties() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:745]
UE4Editor_CoreUObject!ProcessNewlyLoadedUObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:821]
UE4Editor!FEngineLoop::PreInit() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:1562]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:113]
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
ntdlllink text

Please help. Thanks.