Windows ChatGPT Work Desktop renders Project responses as Base64 after latest update (Web version works)

Hello OpenAI team,

I believe I have encountered a serious bug in the latest Windows ChatGPT Work desktop application.

Environment:

  • Windows 11
  • Latest ChatGPT Work desktop app (Microsoft Store version)
  • ChatGPT Plus
  • Google Sign-in

Issue:

After updating to the latest ChatGPT Work desktop app, every Project became unusable.

The web version (chatgpt.com) works perfectly:

  • Chats are normal
  • Projects are normal
  • Conversation history is intact
  • Same account

Only the Windows desktop app is affected.

Symptoms:

  1. Every Project shows a long Base64-like string instead of the assistant response.
  2. Even a brand-new Project immediately breaks after sending a simple message like “Hello”.
  3. Every response ends with:

“user not found, 用户不存在”

  1. A red error icon appears beside every Project.
  2. Project memory never loads.
  3. The desktop app becomes unusable for Projects.

Troubleshooting already attempted:

  • Restarted Windows
  • Logged out and logged back in
  • Reinstalled the desktop application
  • Reset application data
  • Verified that the web version works correctly
  • Verified that the issue affects every Project, including newly created ones

Important observations:

  • This problem only exists in the Windows desktop app.
  • The web version is completely normal.
  • Therefore the cloud data appears intact.
  • It seems the desktop client is incorrectly parsing the server response instead of rendering it.

One additional observation:

The displayed content starts with a JWT/Base64-looking payload (beginning with “eyJ…”) and eventually ends with:

“user not found, 用户不存在”

This appears to be an internal response that is accidentally rendered directly to the UI instead of being processed.

I have attached screenshots demonstrating the issue.

Please investigate whether this is related to the recent ChatGPT Work / Codex desktop update.

Thank you.