[Bug] macOS M4: mini window renders a black rectangle when hovering its top-left area
Resolved 💬 2 comments Opened Jul 15, 2026 by Liu-Lin-Hai Closed Jul 15, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
Environment
- Codex Desktop: 26.707.72221
- macOS: 15.5
- Hardware: Apple M4 (arm64)
Steps to reproduce
- Open a thread in Codex Desktop.
- Open the thread in the mini window / popout view.
- Move the pointer over the top-left area of the mini window.
Actual behavior
A large black rectangle appears over the mini-window content when the pointer enters the top-left area. This is a rendering artifact and obscures the thread content.
Expected behavior
Hovering the mini window should only reveal its normal controls. No black overlay or rendering artifact should appear.
Notes
- The issue reproduces on Apple Silicon (M4) with macOS 15.5.
- I have screenshots showing the mini-window state and the black-overlay state. A screen recording is not available.
- Related but not identical reports:
- #18832 — black box blocking the UI
- #18311 — M4 mini-window/popout rendering failure
2 Comments
<img width="1276" height="852" alt="Image" src="https://github.com/user-attachments/assets/1bf03b5d-2143-4fb4-9147-957a59fee9f2" />
<img width="1024" height="962" alt="Image" src="https://github.com/user-attachments/assets/eb6a29c1-d9ac-45c7-956d-3d16613ef2ab" />
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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