I'm using the latest SA 30 trial on Windows:
Several issues:
1) When I save the Entire project, it saves but displays: Target framework (ext70 commercial) is not installed.

2) When I click on Preview (cmd is running in background), the index.html displays but no CSS is rendered. Chrome shows that
http://localhost:1841/resources/prev...9fd12c23ba.css can't be found. This is true because there is no resources folder.
If I edit the index.html and change the CSS link to the name of the existing css file .arch-internal-preview.css in the root directory it works.

Any ideas?