Hello Team,
We are investigating a startup issue in our Unreal Engine 5.5.4 macOS build. The issue reproduces only on Intel MacBook Pro machines. We have not observed it on non-Intel Macs so far.
Problem:
When AGS - Automatic graphics switching is enabled, the packaged macOS build gets stuck on a red screen during initialization/startup. The app does not proceed to the expected flow. In the reproduced logs, initialization reaches the early game/client startup path, then the app eventually exits with Mac GracefulTerminationHandler.
Important observation:
The issue is not reproducible if Epic Games Launcher or Unreal Editor is already running in the background. With AGS enabled and Epic Launcher/Unreal Editor open, the same build starts correctly. If Epic Launcher/Unreal Editor is closed, the issue reproduces again.
Current test matrix:
1. AGS disabled — issue is not reproduced.
2. AGS enabled + Epic Launcher/Unreal Editor closed — issue is reproduced.
3. AGS enabled + Epic Launcher/Unreal Editor opened in background — issue is not reproduced.
4. Reproduced on two Intel MacBook Pro machines.
Environment:
- Unreal Engine: 5.5.4
- Platform: macOS
- Architecture: x64 / Intel
- Build configuration: Development
- Example device: Intel MacBook Pro, Radeon Pro GPU
I attached VeryVerbose initialization logs for reproduced and non-reproduced cases.
Could you please help us understand what Epic Launcher or Unreal Editor might initialize/provide on Intel macOS that changes this behavior? We would also appreciate suggestions on additional logs, command-line flags, macOS diagnostics, or AGS-related checks that could help isolate the root cause.
Thank you.
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