WebMatrix 2 freezes when trying to open existing Node site

I have an existing Node project sitting in my Dropbox, and when I open it in WebMatrix 2, it detects it as a Node project but then freezes on 'Configuring Site'.

Any ideas on how I could diagnose what is causing this?

For anyone else that runs into this - it was a problem with our online feed. We made a fix, and everything should start to work now. If you're still running into issues, please delete all of the files in %localappdata%\Microsoft\Web Platform Installer\ and try again.