Amazon Q plugin for IntelliJ causing IDE hangs/freezes

[Jitwad]

Describe the bug Amazon Q Plugin specifically for IntelliJ.

• Moving an open file to a new window causes the IDE to hang indefinitely. Affects all open IntelliJ windows.

To reproduce

1. Start IntelliJ with the Amazon Q plugin installed
2. Open any 2 source files
3. Move one of them to a new window, by either drag-n-drop or the file/tab context menu.
4. Within maybe 30 seconds the IDE becomes unresponsive and not acknowledge any interaction.

Expected behavior I should be able to open files in a new window and still use the IDE (multi monitor setup, for example).

Your Environment

• OS: Win 11 Business
• JetBrains product: IntelliJ Enterprise
• JetBrains product version: 2025.1.2 (build #IU-251.26094.121)
• AWS Toolkit version: 3.76.251
• JVM/Python version: OpenJDK Runtime Environment (build 17.0.2+8-86)

Additional context Opened a ticket with JetBrains initially, was determined to be the Amazon Q plugin based on testing and log details from IntelliJ, so they sent me here.

JetBrains Ticket -> IDEA-374507 Opening a file in a NEW WINDOW causing IDE freeze

[Jitwad]

Tried plugin version 3.77.251 on the same IDE version

• eventually freezes up the same way, within a minute. I don't even have to open multiple windows.
• I can trigger a freeze by open up the AWS Toolkit plugin profile selector and switching profiles
• Only silver lining is the chat window/pane appears to be rendering cleanly under this version

[Jitwad]

Tried plugin version 3.78.251 on the same IDE version

• all the same symptoms as above/previous
• The chat/window pane is buggered again -- poor render, not interactive

[dev-k13]

I have been experiencing the same hanging/ freezing issue on IntelliJ IDEA CE 2025.1.2 and Amazon Q plugin 3.78.251

• Closing a tab freezes the IDE
• Closing the IDE freezes
• Q Plugin chat does not work and just remains on "Thinking..." state whenever I enter a prompt

[krishollenbeck]

I have been experiencing the same hanging/ freezing issue on IntelliJ IDEA CE 2025.1.2 and Amazon Q plugin 3.78.251

• Closing a tab freezes the IDE
• Closing the IDE freezes
• Q Plugin chat does not work and just remains on "Thinking..." state whenever I enter a prompt

I'm having the same problems.

[leonsauveterre]

I'm having the same problem. Even the slightest actions can render IDEA non-responsive, like opening a file, closing a project window, or just checking out another branch, etc. Disable all three plugins (Amazon Q, AWS Core, AWS Toolkit) and everything is back to normal.

[Jitwad]

For posterity, I have tried the following combinations since my last comment...

All on:

IntelliJ IDEA 2025.1.3 (Ultimate Edition)
Build #IU-251.26927.53, built on June 23, 2025

• Amazon Q 3.85.251 -> Same issues
• Amazon Q 3.86.251 -> Same issues

This includes, for each install, additionally purging the install dir completely at %USER_DIR%\.aws\amazonq

[csvan]

Just wanted to confirm that this also happens extensively on OSX. It is extremely annoying and renders the IDE virtually unusable.

[ronwarshawsky]

Still a critical issue. Makes an excellent product almost useless.

[xuanthanhvc]

Reverted back to Intellij IDEA 2025.1.5.1 and Q 3.94.251, and I don't see it freezes anymore

[alexander-masko]

I’m experiencing the same problem on macOS with PhpStorm 2025.2.5 and plugin version 3.99.252. Seven of my teammates have confirmed it as well. This is a critical issue and is currently blocking us from using the plugin.