Steps to reproduce:
1. Set Preferences/HTML Exporter/Default Preview Browser to Chrome.
2. Set Project/Configuration Settings/Preview Browser to Chrome.
3. Exit C2 and restart (in case that's necessary.
4. Ensure all browsers are closed.
5. Load a project.
...Message about not loading browser....
Chrome would load and preview.
Notes: Chrome is installed and up to date on my system.
Notes: I'm puzzled why you can set the preview browser in two different places. I understand that they're not quite the same but seems confusing.