When you upgrade Piwik to the latest version, it sometimes happen that Piwik stops working — especially when the User Interface is not working (blank white page, widgets not loading, error message, etc.).

There are a few things to check that will most likely resolve the User Interface issue you are having:

  • 1) Delete your browser cache or try to access your Piwik with a different browser. If it still does not work…
  • 2) Delete all files in piwik/tmp/*. After deleting the files and directories, refresh the page. If it still does not work…
  • 3) Check your web server error logs. Maybe your error log will contain an explanation for the problem. If the log file has no Piwik related error…
  • 4) Reupload all Piwik files from the latest version. Sometimes, there are errors while uploading files and some of your Piwik files were maybe not overwritten by the latest version. Upload all files again, and check in your FTP software that the upload was successful.

Also, check out the other FAQs in this “Troubleshooting” category, as there might be other solutions for your problem.

If it still does not work, please search the Piwik Forums or search this website, and if there is no post about your problem, please create a new topic.