Serial Monitor not working anymore

[Polaxis]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The serial monitor disappeared: I have been using it forever but now it is just a blank space… Did I miss something ? Thanks !

Steps to Reproduce

Just head to Serial Monitor

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.2.36 (Universal)
VSCode Version: 1.105.1
Commit: 55c9bc11e99cedd1fb93fbb7996abf779c583150
Date: 2025-12-18T06:25:21.733Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

[deanrie]

Hey, thanks for the report.

The Serial Monitor is usually part of an extension (like PlatformIO IDE, Arduino, etc.), not a built-in Cursor feature. I need more info to diagnose:

1. Which extension are you using for the Serial Monitor? (check in Extensions)
2. Open Developer Console (Help > Toggle Developer Tools > Console) - are there any errors related to Serial Monitor?
3. When did the issue start? After updating Cursor to 2.2.36?
4. Try reinstalling the extension: Extensions > find the Serial Monitor extension > Uninstall > restart Cursor > install it again.

Also, try disabling all other extensions temporarily with Cmd+Shift+P → Disable All Installed Extensions to check for conflicts.

Please share your results and a screenshot of the console if there are errors.

[Polaxis]

In fact, I was migrating from VS Code using the Microsoft Serial Monitor, but now it has disappeared from Cursor. Now I am forced to use a terminal monitor like Picocom