Beta start-storybook hangs

[larsenwork]

Describe the bug
Start-storybook doesn't complete for me on beta version.

To Reproduce

1. Have beta version installed
2. npm run storybook

Current behaviour
It hangs without completing the build and if I ctrl+c it actually completes for a split second but then closes

Expected behavior
It completes building and I can see my storybook

Code snippets
(note the ^C)

🦁 npm run storybook

> @ storybook /Users/andreaslarsen/Git/omhu-com-web
> start-storybook -p 6006

info @storybook/react v6.2.0-beta.6
info 
info => Loading presets
info => Loading 1 config file in "/Users/andreaslarsen/Git/omhu-com-web/.storybook"
info => Loading 8 other files in "/Users/andreaslarsen/Git/omhu-com-web/.storybook"
info => Adding stories defined in "/Users/andreaslarsen/Git/omhu-com-web/.storybook/main.js"
info => Using PostCSS preset with postcss@8.2.6
info => Using default Webpack4 setup
10% building 1/1 modules 0 activeinfo => Using cached manager
webpack built preview 3738e1363425067d3ecd in 11356ms
^C╭───────────────────────────────────────────────────╮
│                                                   │
│   Storybook 6.2.0-beta.6 started                  │
│   12 s for preview                                │
│                                                   │
│    Local:            http://localhost:6006/       │
│    On your network:  http://192.168.1.14:6006/    │
│                                                   │
╰───────────────────────────────────────────────────╯

System

Environment Info:

  System:
    OS: macOS 11.2.2
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
  Binaries:
    Node: 14.16.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 6.14.11 - /usr/local/bin/npm
  Browsers:
    Chrome: 89.0.4389.72
    Firefox: 85.0.2
    Safari: 14.0.3
  npmPackages:
    @storybook/addon-actions: ^6.2.0-beta.6 => 6.2.0-beta.6 
    @storybook/addon-essentials: ^6.2.0-beta.6 => 6.2.0-beta.6 
    @storybook/addon-links: ^6.2.0-beta.6 => 6.2.0-beta.6 
    @storybook/addon-postcss: ^2.0.0 => 2.0.0 
    @storybook/react: ^6.2.0-beta.6 => 6.2.0-beta.6 

Additional context
I tried clearing the /node_modules/.cache and also starting this in a new terminal without luck.

[larsenwork]

FWIW the issue persists on v6.2.0-beta.10

[larsenwork]

Hmm... a machine restart resolved the issue. Closing this until I can repro consistently.