Here is why you always should clear your browser history after a Sitecore upgrade

Recently, I did a Sitecore upgrade from version 8.1 Initial Release to version 8.2 Update 5. Basically, I just had to disabled xDB, run a couple of SQL queries, install the Sitecore Update Installation Wizard and finally install the upgrade package. Easy! But then, after finishing the upgrade, I opened Content Editor and surprise!

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