Description

When pressing the button for example 2.3 in the UMG map of content examples (Spawns a 3D UMG Widget), the editor crashes.

Steps to Reproduce
  1. Download ContentExamples from the Learn tab of the Epic Games Launcher
  2. Open the latest 4.15 Binary engine
  3. Open ContentExamples project in UE4
  4. Select File > Open Level > UMG
  5. PIE
  6. Navigate to and press the button on example 2.3

Results: Editor crashes

Callstack
UE4Editor-MetalRHI.dylib!FMetalStateCache::SetRenderState() 
UE4Editor-MetalRHI.dylib!FMetalRenderPass::PrepareToRender() 
UE4Editor-MetalRHI.dylib!FMetalRenderPass::DrawIndexedPrimitive() 
UE4Editor-MetalRHI.dylib!FMetalRHICommandContext::RHIDrawIndexedPrimitive() 
UE4Editor-SlateRHIRenderer.dylib!FSlateRHIRenderingPolicy::DrawElements() 
UE4Editor-SlateRHIRenderer.dylib!FSlate3DRenderer::DrawWindowToTarget_RenderThread() 
UE4Editor-UMG.dylib!FWidgetRenderer::DrawWindow(UTextureRenderTarget2D*, TSharedRef<FHittestGrid, (ESPMode)0>, TSharedRef<SWindow, (ESPMode)0>, FGeometry, FSlateRect, float)::EURCMacro_FWidgetRenderer_DrawWindow::DoTask()
UE4Editor-UMG.dylib!TGraphTask<FWidgetRenderer::DrawWindow(UTextureRenderTarget2D*, TSharedRef<FHittestGrid, (ESPMode)0>, TSharedRef<SWindow, (ESPMode)0>, FGeometry, FSlateRect, float)::EURCMacro_FWidgetRenderer_DrawWindow>::ExecuteTask()
UE4Editor-Core.dylib!FNamedTaskThread::ProcessTasksNamedThread() 
UE4Editor-Core.dylib!FNamedTaskThread::ProcessTasksUntilQuit() 
UE4Editor-Core.dylib!FTaskGraphImplementation::ProcessThreadUntilRequestReturn() 
UE4Editor-RenderCore.dylib!RenderingThreadMain() 
UE4Editor-RenderCore.dylib!FRenderingThread::Run() 
UE4Editor-Core.dylib!FRunnableThreadPThread::Run() 
UE4Editor-Core.dylib!FRunnableThreadPThread::_ThreadProc() 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown> 

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Fixed
ComponentRendering
Affects Versions4.15
Target Fix4.15
Fix Commit3265873
Main Commit3389599
Release Commit3265873
CreatedJan 19, 2017
ResolvedJan 20, 2017
UpdatedApr 27, 2018