From time to time, on the rare occasion you may seen a CSRF Token Error and are blocked from using Keen's website in some way.
Browser cache (also know as Internet cache) contains records of every item you have viewed or downloaded while Internet surfing. So when you visit the same page for a second time, the browser speeds up display time by loading the page locally from cache instead of downloading everything again. At times there can be a mismatch between the cached and most up-to-date version of the website, causing a failure in resolution.
To see the most up-to-date version or changes made to the site webpage you just uploaded, we need to overrule the Internet cache.
Here are some ways to fix this issue
Try refreshing the page where you saw the error. Some shortcut keys for doing a hard or forced refresh.
Windows: ctrl + F5
Mac/Apple: Apple + R or command + R
Clear cached memory
To ensure you see the latest version of a site you need to clear the cache memory. Sometimes, a simple hard refresh won't work and you need to clear the cache by hand. On this site you can find step by step guides for Chrome, Firefox 3, Firefox 2, Internet Explorer 8, Internet Explorer 7, Internet Explorer 6, Safari and more on how to refresh your cache.
Restart your browser.