I am unable to display a Crash Course chapter, or the video stops midway through.

Occasionally we have visitors mention they are having issues viewing one of the Crash Course chapters. 
The issues are not specific to any one given chapter, and most often the problems have to do with browser issues, computer processing/memory, or speed of Internet connection. The current Crash Course format provides a rich viewing experience with high-quality video, but the size of the videos has been known to cause viewing issues for some visitors.

The problem can typically be solved by performing one or more of the following:

• Clear the browser cache.  Some information in the cache may
  have
  corrupted the video download.
• Close all instances of the browser and restart.  Often the
  video
  will not be displayed in this situation because the browser is using too
  much computer memory.  This might be because the video is competing for
  memory with another web page, or the viewer has multiple chapters
  running in multiple windows at the same time.
• Avoid using "embedded" browsers, such as the browser which
  comes
  with AOL.  Instead, access the Internet using a fully functional
  browser such as Firefox or Internet Explorer.
• Reboot the computer.  Sometimes a program running in the
  operating system might be causing a conflict with the video.
• Attempt to watch the video with a different Internet
  connection. 
  We have had situations where the viewer's Internet connection is either
  having problems, or just not powerful enough to watch the videos.  He or she was then able to see the video when they took their computer to a
  coffee shop and connected to the shop's wireless Internet connection.
• Attempt to watch the video on a different computer.  Try on
  your
  computer at work, or on a friend's computer.  Some older computers may
  not have the processing power or memory capacity to handle multiple
  videos running at once.