One of my charts is missing
First, make sure you have the latest version of Adobe Flash Player installed on your machine. If you don't have the plug-in, you can download it from the Adobe site.
You can also try clearing your browser's cache to ensure that you're viewing the most updated version of Google Finance. One way to do this is to visit the Google Finance homepage and then refresh the page while holding the Shift key (or Ctrl key for certain browsers). Reloading the page while holding Shift will clear your browser's cache only for the site you're refreshing and may restore the charts functionality. You can also try clearing your browser's cache.
Note: Certain securities don't trade with enough volume to generate a chart. This often happens with penny stocks or stocks trading on foreign exchanges. Also, privately held companies will not have charts.