[Windows] Codex stopped opening after updating to v26.901.6511.0

What issue are you seeing?

After updating Codex to v26.901.6511.0 on Windows, Codex no longer opens.
When I launch Codex, no GUI window appears. However, multiple ChatGPT.exe processes are created and remain running in the background.
The processes are responsive, but they do not create a visible window. The MainWindowHandle is 0 and MainWindowTitle is empty.
There is no error message displayed.

What steps can reproduce the bug?

1. Update Codex to v26.901.6511.0.
2. Launch Codex from Windows.
3. No application window appears.
4. Open Task Manager and observe multiple ChatGPT.exe processes running in the background.

The issue occurs every time I try to launch Codex after the update.

What is the expected behavior?

Codex should launch normally and display the Codex desktop application window.

Additional information

System:

• Windows 11
• Codex version: 26.901.6511.0
• x64

I manually launched ChatGPT.exe from its installation directory, but the result was the same: the process started but no window appeared.

I also tested the following launch arguments:

--disable-gpu

--disable-gpu --disable-software-rasterizer

Neither fixed the issue.

I checked the process state with PowerShell:

Get-Process ChatGPT | Select-Object Id,CPU,Responding,MainWindowHandle,MainWindowTitle,Path

The processes showed:

Responding: True
MainWindowHandle: 0
MainWindowTitle: empty

The executable path is:

C:\Program Files\WindowsApps\OpenAI.Codex_26.901.6511.0_x64__2p2nqsd0c76g0\app\ChatGPT.exe

The previous version worked normally. The problem appeared immediately after updating to v26.901.6511.0.

Start by reproducing the launch from ChatGPT.exe on Windows 11 at v26.901.6511.0, then inspect the processes with the provided PowerShell command and compare the behavior with the previous version. Done means launching Codex creates a visible desktop window instead of responsive background processes with MainWindowHandle 0.