Not sure howto make a reproducible example here - I started working with blogdown yesterday and was able to get a site up and running on Netlify. I wrote an initial post this morning and was able to use blogdown::serve_site() to preview changes in the Viewer window. I re-booted my machine and stepped away for a few minutes - when I tried to work again serve_site() doesn't show anything. The red stop sign appears for a second then disappears.
EDIT: I'm able to make changes and push to Github, and updates the site. I just can't see the updates locally.
I have a similar issue with blogdown. It may be related to your problem. I am a Mac user and a newbie to blogdown.
Error: object 'CF.mb' not found
Error in render_page(f) :
Failed to render 'content/post/2018-02-10-academic-kickstart.Rmd'
Blogdown is attempting to call a file 'CF.md' that does not exist.
More information about my goals and problem can be seen at: