A fix has been made in 4.16.2 for half these crashes, and another fix will be in 4.17 for the remainder.
This is a common crash among Mac users in 4.16. It is spread out among many separate CrashGroups, with slight variations in Callstack.
Some Example CrashGroups
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Crash Details from Log File
LogStreaming:Warning: Failed to read file '../../../Engine/Content/Tutorial/InWorldBlueprintEditing/TutorialAssets/whatYouAreMaking.png' error. LogSlate: Could not find file for Slate resource: ../../../Engine/Content/Tutorial/InWorldBlueprintEditing/TutorialAssets/whatYouAreMaking.png LogSlate: Took 0.000112 seconds to synchronously load lazily loaded font '../../../Engine/Content/Editor/Slate/Fonts/Roboto-Italic.ttf' (157K) LogMac:Error: appError called: Assertion failed: Assertion failed: IsValid() [File:Runtime/Core/Public/Templates/SharedPointer.h] [Line: 835] LogCrashTracker: LogMac: === Critical error: === SIGSEGV: invalid attempt to access memory at address 0x3 LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0xb30af1b (filename not found) [in UE4Editor-Core.dylib] FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0xb506d7f (filename not found) [in UE4Editor-Core.dylib] FOutputDevice::Logf(wchar_t const*, ...) Address = 0xb5e788d (filename not found) [in UE4Editor-Core.dylib] FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0xb54dafe (filename not found) [in UE4Editor-Core.dylib] __31-[FCocoaTextView selectedRange]_block_invoke Address = 0xb478ebc (filename not found) [in UE4Editor-Core.dylib] invocation function for block in PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0xb52a770 (filename not found) [in UE4Editor-Core.dylib] FCocoaRunLoopSource::Process(__CFString const*) Address = 0xb4c27a4 (filename not found) [in UE4Editor-Core.dylib] -[FCocoaRunLoopSourceInfo perform] Address = 0xb4c21f6 (filename not found) [in UE4Editor-Core.dylib] __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__() Address = 0xbfaed321 (filename not found) [in CoreFoundation] __CFRunLoopDoSources0() Address = 0xbface21d (filename not found) [in CoreFoundation] __CFRunLoopRun() Address = 0xbfacd716 (filename not found) [in CoreFoundation] CFRunLoopRunSpecific() Address = 0xbfacd114 (filename not found) [in CoreFoundation] PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0xb4c313a (filename not found) [in UE4Editor-Core.dylib] bool MainThreadReturn<bool>(bool () block_pointer, NSString*) Address = 0xb514a03 (filename not found) [in UE4Editor-Core.dylib] FMacTextInputMethodSystem::DeactivateContext(TSharedRef<ITextInputMethodContext, (ESPMode)0> const&) Address = 0xb514d87 (filename not found) [in UE4Editor-Core.dylib] FSlateEditableTextLayout::HandleFocusLost(FFocusEvent const&) Address = 0x11be2886 (filename not found) [in UE4Editor-Slate.dylib] FSlateApplication::SetUserFocus(FSlateUser*, FWidgetPath const&, EFocusCause) Address = 0x1181b882 (filename not found) [in UE4Editor-Slate.dylib] FSlateApplication::SetUserFocus(unsigned int, FWidgetPath const&, EFocusCause) Address = 0x1181ea0f (filename not found) [in UE4Editor-Slate.dylib] ...more in log file...
User Descriptions
Repro steps currently unknown. Tried the user description of multiple right-clicks in Event Graph, but no crash. There was slight lag, but no Ensure either.
SEGV_MAPERR at 0x3 UE4Editor-Core.dylib!<Unknown> UE4Editor-Core.dylib!<Unknown> UE4Editor-Core.dylib!FCocoaRunLoopSource::Process() UE4Editor-Core.dylib!<Unknown> CoreFoundation!Unknown() CoreFoundation!Unknown() CoreFoundation!Unknown() CoreFoundation!Unknown() UE4Editor-Core.dylib!PerformBlockOnThread(FCocoaRunLoopSource&, void() UE4Editor-Core.dylib!bool MainThreadReturn<bool>(bool() UE4Editor-Core.dylib!FMacTextInputMethodSystem::DeactivateContext(TSharedRef<ITextInputMethodContext,() UE4Editor-Slate.dylib!FSlateEditableTextLayout::HandleFocusLost() UE4Editor-Slate.dylib!FSlateApplication::SetUserFocus() UE4Editor-Slate.dylib!FSlateApplication::SetUserFocus() UE4Editor-Slate.dylib!FSlateApplication::RoutePointerDownEvent() UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonDownEvent(TSharedPtr<FGenericWindow,() UE4Editor-Slate.dylib!FSlateApplication::OnMouseDown(TSharedPtr<FGenericWindow,() UE4Editor-Core.dylib!FMacApplication::ProcessMouseDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow,() UE4Editor-Core.dylib!FMacApplication::ProcessEvent() UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents() UE4Editor-Slate.dylib!FSlateApplication::TickPlatform() UE4Editor-Slate.dylib!FSlateApplication::Tick() UE4Editor!FEngineLoop::Tick() UE4Editor!GuardedMain() UE4Editor!<Unknown> UE4Editor-Core.dylib!<Unknown> Foundation!Unknown() libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown>
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-46069 in the post.