# UE 5.6.1 Audio Insights crashes immediately on macOS (Apple Silicon M4) due to duplicate Slate style registration **URL:** \ **Category:** Issues and Bug Reporting (Unreal Engine)\ **Tags:** audio-bugs, unreal-engine\ **Created:** [August 2, 2026, 10:38pm UTC](https://forums.unrealengine.com/t/ue-5-6-1-audio-insights-crashes-immediately-on-macos-apple-silicon-m4-due-to-duplicate-slate-style-registration/2740179 "2026-08-02T22:38:05Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![metalgunner87](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@metalgunner87](https://forums.unrealengine.com/u/metalgunner87)\ **Post date:** [August 2, 2026, 10:38pm UTC](https://forums.unrealengine.com/t/ue-5-6-1-audio-insights-crashes-immediately-on-macos-apple-silicon-m4-due-to-duplicate-slate-style-registration/2740179/1 "2026-08-02T22:38:06Z")
### Summary Audio Insights crashes immediately upon opening the Audio Insights window in Unreal Engine 5.6.1 on macOS. The crash is 100% reproducible across all projects, including brand-new blank Blueprint projects. The assertion occurs while registering the Audio Insights Slate style: Assertion failed: !FindSlateStyle(SlateStyleName) File: Runtime/SlateCore/Private/Styling/SlateStyleRegistry.cpp Line: 21 The crash occurs before any Audio Insights UI is displayed. ### What Type of Bug are you experiencing? Audio ### Steps to Reproduce Launch Unreal Engine 5.6.1. Create a brand-new Blank Blueprint project. Enable the Audio Insights plugin. Restart the editor. Select: Tools → Audio Insights The editor immediately crashes before the Audio Insights window appears. ### Expected Result The Audio Insights window opens normally. ### Observed Result The editor crashes immediately with: Assertion failed: !FindSlateStyle(SlateStyleName) ### Affects Versions 5.6 ### Platform(s) Mac ### For crash reports, include your callstack Assertion failed: !FindSlateStyle(SlateStyleName) [File:./Runtime/SlateCore/Private/Styling/SlateStyleRegistry.cpp] [Line: 21] 0x0802d430 UnrealEditor-Core.dylib!FGenericPlatformMisc::RaiseException(unsigned int) 0x08381930 UnrealEditor-Core.dylib!FOutputDevice::LogfImpl(char16\_t const\*, …) 0x08273078 UnrealEditor-Core.dylib!FDebug::CheckVerifyFailedImpl2V(char const\*, char const\*, int, char16\_t const\*, char\*) 0x0826e8f4 UnrealEditor-Core.dylib!FDebug::CheckVerifyFailedImpl2(char const\*, char const\*, int, char16\_t const\*, …) 0x0634955c UnrealEditor-SlateCore.dylib!FSlateStyleRegistry::RegisterSlateStyle(ISlateStyle const&) 0x7897dc28 UnrealEditor-AudioInsights.dylib!UE::Audio::Insights::FSlateStyle::FSlateStyle() 0x78913250 UnrealEditor-AudioInsights.dylib!UE::Audio::Insights::FLogDashboardViewFactory::GetIcon() const 0x77b6b4a4 UnrealEditor-AudioInsightsEditor.dylib!UE::Audio::Insights::FEditorDashboardFactory::RegisterTabSpawners() 0x77b69788 UnrealEditor-AudioInsightsEditor.dylib!UE::Audio::Insights::FEditorDashboardFactory::MakeDockTabWidget(FSpawnTabArgs const&) 0x050c7228 UnrealEditor-Slate.dylib!FTabManager::SpawnTab(FTabId const&, TSharedPtr\ const&, bool) 0x050cb5f0 UnrealEditor-Slate.dylib!FTabManager::RestoreArea\_Helper(TSharedRef\ const&, TSharedPtr\ const&, bool, FSidebarTabLists&, EOutputCanBeNullptr, bool) 0x050cfab4 UnrealEditor-Slate.dylib!FTabManager::RestoreSplitterContent(TSharedRef\ const&, TSharedRef\ const&, TSharedPtr\ const&, FSidebarTabLists&) 0x050cd1a0 UnrealEditor-Slate.dylib!FTabManager::RestoreArea\_Helper(TSharedRef\ const&, TSharedPtr\ const&, bool, FSidebarTabLists&, EOutputCanBeNullptr, bool) 0x050c140c UnrealEditor-Slate.dylib!FTabManager::RestoreArea(TSharedRef\ const&, TSharedPtr\ const&, bool, EOutputCanBeNullptr, bool) 0x050c579c UnrealEditor-Slate.dylib!FTabManager::InvokeTab\_Internal(FTabId const&, bool, bool) 0x050c55c8 UnrealEditor-Slate.dylib!FTabManager::InvokeTab\_Internal(FTabId const&, bool, bool) 0x050c4db4 UnrealEditor-Slate.dylib!FTabManager::TryInvokeTab(FTabId const&, bool) 0x050c95ac UnrealEditor-Slate.dylib!FTabManager::InvokeTabForMenu(FName) 0x05135b24 UnrealEditor-Slate.dylib!TBaseSPMethodDelegateInstance\::ExecuteIfSafe() const 0x0519501c UnrealEditor-Slate.dylib!SMenuEntryBlock::OnClicked(bool) 0x051867e0 UnrealEditor-Slate.dylib!SMenuEntryBlock::OnMenuItemButtonClicked() 0x05213bac UnrealEditor-Slate.dylib!TBaseSPMethodDelegateInstance\::Execute() const 0x0526f7b4 UnrealEditor-Slate.dylib!SButton::ExecuteOnClick() 0x0528c724 UnrealEditor-Slate.dylib!SButton::OnMouseButtonUp(FGeometry const&, FPointerEvent const&) 0x0500607c UnrealEditor-Slate.dylib!FSlateApplication::RoutePointerUpEvent(FWidgetPath const&, FPointerEvent const&) 0x04fc4f1c UnrealEditor-Slate.dylib!FSlateApplication::ProcessMouseButtonUpEvent(FPointerEvent const&) 0x0500ba64 UnrealEditor-Slate.dylib!FSlateApplication::OnMouseUp(EMouseButtons::Type, UE::Math::TVector2) 0x04d7b110 UnrealEditor-ApplicationCore.dylib!FMacApplication::ProcessMouseUpEvent(FDeferredMacEvent const&, TSharedPtr\) 0x04d75974 UnrealEditor-ApplicationCore.dylib!FMacApplication::ProcessEvent(FDeferredMacEvent const&) 0x04d755bc UnrealEditor-ApplicationCore.dylib!FMacApplication::ProcessDeferredEvents(float) 0x04fe2518 UnrealEditor-Slate.dylib!FSlateApplication::TickPlatform(float) 0x04fe1a88 UnrealEditor-Slate.dylib!FSlateApplication::Tick(ESlateTickType) 0x0454c0fc UnrealEditor!FEngineLoop::Tick() 0x04554614 UnrealEditor!GuardedMain(char16\_t const\*) 0x0456e400 UnrealEditor!-[UEAppDelegate runGameThread:] 0x081e7b4c UnrealEditor-Core.dylib!-[FCocoaGameThread main] 0x9967aba8 Foundation! **NSThread\_\_start** () 0x97fc7c0c libsystem\_pthread.dylib!\_pthread\_start() 0x97fc2b80 libsystem\_pthread.dylib!thread\_start() ### Additional Notes Additional investigation: I reproduced this in a brand-new Blank Blueprint project with only the Audio Insights plugin enabled. I verified the engine installation, deleted project caches/configuration, and inspected AudioInsightsStyle.h. The crash occurs during FSlateStyleRegistry::RegisterSlateStyle(\*this) inside UE::Audio::Insights::FSlateStyle, suggesting a duplicate Slate style registration before the Audio Insights window is created. ---
**Author:** ![Honsehonse](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Honsehonse](https://forums.unrealengine.com/u/Honsehonse)\ **Post date:** [August 18, 2026, 4:03pm UTC](https://forums.unrealengine.com/t/ue-5-6-1-audio-insights-crashes-immediately-on-macos-apple-silicon-m4-due-to-duplicate-slate-style-registration/2740179/2 "2026-08-18T16:03:02Z")
Same behaviour here on a M1 Pro Macbook