Codex Desktop 26.513.31313 on macOS 26.5 – "Oops, an error has occurred" when returning to chats

Environment

• App: Codex Desktop
• Version: 26.513.31313
• OS: macOS 26.5 (25F71) "Tahoe"
• Hardware: Mac (Apple Silicon)
• Chrome extension: Codex Chrome extension installed and enabled

Issue

Almost every conversation eventually shows the generic error screen:

"Oops, an error has occurred" [Buttons: "Check for updates" and "Try again"]

This is not just a model error — it appears at the app level and blocks the whole conversation.

Steps to Reproduce

1. Open Codex Desktop on macOS.
2. Sign in normally.
3. Start a new chat.
4. Send a message (this usually works and gets a reply).
5. Navigate away (e.g., click another conversation or change view).
6. Navigate back to the previous chat.

Expected: The previous chat opens and I can continue the conversation.

Actual: The chat shows the "Oops, an error has occurred" screen. "Try again" rarely recovers it. Once a thread is in this state it often stays broken. Sometimes the error appears even on brand-new chats.

What I Already Tried

• Signing out of Codex and signing back in (temporarily fixes it for one session).
• Restarting the app and the Mac.
• Checking for updates from inside the app (no newer version offered).
• The error occurs even on simple, text-only prompts — not only when using the Chrome control feature.

Notes

• Issue began after updating to 26.513.31313.
• Sign-out/sign-in provides temporary relief but the error returns as soon as you navigate away and back to a chat.
• Happy to provide logs or run a diagnostic build if needed.