Feedback source

None

GitHub Copilot plugin version

No response

JetBrains IDE and version

No response

Platform

I am experiencing a blocking issue when using GitHub Copilot with IntelliJ IDEA 2025 Ultimate Edition on Windows.

After installing the latest GitHub Copilot plugin, IntelliJ opens normally, but as soon as I open Copilot Chat, the IDE becomes frozen / unresponsive.
I have to force-close IntelliJ because it never recovers.

This issue happens every time, even after restarting the IDE and the computer.

Steps to reproduce

Launch IntelliJ IDEA 2025 Ultimate Edition

Open any existing project (Java / Gradle / Maven / other — reproducible with any project type)

Wait until the IDE finishes indexing

Click on GitHub Copilot Chat in the right sidebar (or use the Ctrl + Shift + \ shortcut)

The Copilot Chat panel begins to load

The IDE freezes and becomes completely unresponsive

The only way to recover is to force-close IntelliJ

Logs (optional)

No response

Expected behavior

The user should be able to:

type prompts in the chat,

receive responses from Copilot,

continue interacting with the IDE and writing code while Copilot Chat is active.

Actual behavior

it does not work

Additional information

No response