Unreal Engine Issues and Bug Tracker (UE-9399)

Description

Crash while switching between tabs in the main tab bar. It's possible this occurs when one of the tabs is being dragged due to the mouse/trackpad still holding the tab after being released.

Crash Report:
[Link Removed]

Call Stack:

<unknown module>! PerformBlockOnThread(FCocoaRunLoopSource&, void () 
<unknown module>! MainThreadCall(void () 
<unknown module>! (anonymous namespace) 
<unknown module>! SEditableText::Tick(FGeometry const&, double, float) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SBox::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SBorder::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SMenuAnchor::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SBorder::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SPanel::PaintArrangedChildren(FPaintArgs const&, FArrangedChildren const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SSplitter::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SOverlay::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SBorder::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SCompoundWidget::OnPaint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWidget::Paint(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! SWindow::PaintWindow(FPaintArgs const&, FGeometry const&, FSlateRect const&, FSlateWindowElementList&, int, FWidgetStyle const&, bool) 
<unknown module>! FSlateApplication::DrawWindowAndChildren(TSharedRef<SWindow, (ESPMode) 
<unknown module>! FSlateApplication::PrivateDrawWindows(TSharedPtr<SWindow, (ESPMode) 
<unknown module>! FSlateApplication::Tick() 
<unknown module>! FEngineLoop::Tick() 
<unknown module>! GuardedMain(wchar_t const*) 
<unknown module>! -[UE4AppDelegate() 
<unknown module>! -[FCocoaGameThread() 
<unknown module>! __NSThread__main__() 
<unknown module>! _pthread_body() 
<unknown module>! _pthread_body() 
<unknown module>! thread_start()

Steps to Reproduce

1. Open any project
2. Open any Blueprint
3. Move the Blueprint tab into the main tab bar
4. Switch between the level tab and the blueprint tab a few times

Result:
Crash. It's possible this occurs when one of the tabs is being dragged due to the mouse/trackpad still holding the tab after being released.

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Fixed

Component	Tools
Affects Versions	4.7, 4.8
Target Fix	4.7

Fix Commit	2441533
Release Commit	2441666

Created	Feb 7, 2015
Resolved	Feb 11, 2015
Updated	Apr 27, 2018

View Jira Issue

UE-9399

Crash on Mac while switching between tabs in the main tab bar

Crash on Mac while switching between tabs in the main tab bar

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