[Windows] ChatGPT 26.820.60940 fails with "invalid transport in mcp_servers.codex_app"; Beta 26.727.40816 works

### What version of the Codex App are you using (From “About Codex” dialog)? Version 26.820.60940 ### What subscription do you have? Pro ### What platform is your computer? Microsoft Windows NT 10.0.26200.0 x64 ### What issue are you seeing? Stable app version ChatGPT / Codex & OWL 26.820.60940 Released Aug 25, 2026 MSIX package version: OpenAI.Codex 26.820.7780.0 Working comparison version ChatGPT (Beta) / Codex & OWL 26.727.40816 Released Jul 30, 2026 Platform Windows 11 Home 10.0.26200 Build 26200, x64 Dell XPS 16 (Dell 16 Premium) DA16250 Intel Core Ultra 7 255H 32 GB RAM WSL/Ubuntu workspace Issue Immediately after updating Stable to 26.820.60940, Codex Desktop can no longer start or resume chats in my WSL project. The application displays: ChatGPT can't load config.toml, so this thread can't resume. Fix config.toml: invalid transport in mcp_servers.codex_app After saving the file, reopen the thread. The same error occurs when creating a completely new chat, so this is not limited to existing thread state. There is no [mcp_servers.codex_app] or [mcp_servers.codex_apps] entry in my user, system, or project TOML configuration. I searched the active WSL config layers shown by /debug-config: /etc/codex/config.toml /home/<user>/.codex/config.toml /home/<user>/Development/ETL - WSL/.codex/config.toml and none contain codex_app or codex_apps. I also tested: features.apps = false and disabled codex-app-tools; neither changes the error. Important isolat

Posted by itsnoahvandal on Aug 25, 2026, 9:44 PM

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