ChatGPT Mac App Not Working? How to Fix It (2026)
Update — May 12, 2026: The certificate revocation went live on schedule on May 8, 2026. If your ChatGPT, Codex, Codex CLI, or Atlas Mac app now refuses to open and shows a “damaged” or “cannot be verified” warning, this guide still works; the fastest fix is a fresh download from chatgpt.com/download, since the in-app […]
