[BUG] missing Cowork tab + “yukonSilver not supported”

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I have 2 computers, both windows 11 pro. Both running the current version of Claude App Version 1.3109.0 (35cbf6). Cowork tab is missing on both computers. On one, I am unable to enable virtualization features, but they are enabled on the other computer.

desktop app version, Windows 11 Pro, your CPU (AMD Ryzen 3 4300U)
Desktop app version
Windows 11 Pro
Your CPU (AMD Ryzen 3 4300U)
The exact log line: yukonSilver not supported

cowork_vm_node.log

What Should Happen?

the cowork tab should be visible

Error Messages/Logs

log attached to main post

Steps to Reproduce

no steps, just not there

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.3109.0 (35cbf6)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_