While this could be caused by a variety of different issues, here are some general steps to take to try and troubleshoot it.
- Completely delete the plugin (deactivate and then delete files) and then re-install it. Simple, I know, but often works wonders. Try uploading the plugin files manually as well as installing from within the admin panel using the search to see if either make a difference.
- Try installing the plugin using the Jetpack combo plugin.
- Look in the plugin’s folder for a
.htaccess
file. If found, rename it tohtaccess
(drop the period) and see if that solves it. If so, your server configuration needs to change slightly.- Rename the file back to
.htaccess
(put the period back) - Add
AllowOverride FileInfo Limit
to the top of the.htaccess
file - Test again. For more info see here: http://wordpress.org/support/topic/plugin-wordpresscom-stats-stats-graph-missing-after-update#post-1366537
- Rename the file back to
If none of the above work, then let us know what server and OS you’re running, as well as any errors in your PHP and error logs that you may think are relevant.