Q:

CSS Refuses to Update

Environment Information

Framework: Laravel 5
Application Environment: Vagrant, Virtual Box
OS: Mac OS X Yosemite
Browser: Chrome

What's Happening:
CSS will not update after the initial page load.  My vagrant environment uses a file share, and I have validated that the CSS changes are updating upon performing a save; but the page still renders outdated CSS.
I have performed all of the common cache clearing techniques manually, and have used the "Clear Cache" Chrome extension.   
The Question(s)
It's behaving as though Vagrant / Virtual Box have their own caching mechanism, and that is somehow interfering with my updates. If that exists, is there a way to turn it off?
Does the Laravel 5 File cache driver house, or use, cached data outside of the storage/ directory? 
What I've Done

[Failure] Performed Hard Refresh
[Failure] Cleared Browser Cache
[Failure] Deleted the view, session and cache files located at: storage/framework/
[Failure] Added a Cache buster: {{ asset('main.css').date('?ts=His')
[Failure] Used Laravels artisan clear cache: php artisan cache:clear
[Works for initial load] vagrant halt / vagrant up
[Works for initial load] Rebooted machine

Examples

A:

This behavior has actually been noticed before, and addressed in this Google Forum conversation. It is a failure of the sendfile() syscall within the web server daemon, as something is broken in Virtualbox.
The TL;DR version is that you need to add EnableSendfile off to Apache or sendfile off; for nginx. 
After that, you should be golden.

