Middleman hangs forever

[meowsus]

On an app that looks like this:

$ ls -R source/

source:
access-articles-in-javascript.html.md
add-content.html.md
add-a-party-snail.html.md
 ... 115 more .html.md files ...

source/images:
3-variants-1-option.png
3-variants-3-options.png
3-years-primary-image.png
 ... 118 more .png files ...

source/javascripts:
jquery.js
lunr.js
site.js

source/layouts:
layout.erb

source/release_notes:
release-3-0-0.html.md
release-3-0-10.html.md
release-3-0-11.html.md
 ... 80 more .html.md files ...

source/stylesheets:
highlighting.css.scss
site.css.scss

having activate :autoprefixer outside of the configure :build block causes bundle exec middleman server to never resolve a page request. It will sit there and hang for many, many hours, at least. I stopped the request before it resolved since it looked as if it would never do so.

Having the activate method within the build configuration block remedies the situation.

Nabbed this trick from middleman/middleman#2148

[bostonaholic]

I am also having this issue. Moving the activate :autoprefixer block inside the configure :build block seems to work for me.