I am using the enterprise version of Qlik Sense and from time to time, when I am working on the published application, appears suddenly the error : "An error has occured. Access denied" and after I click on the close button, I can continue working on the sheet I was previously working, but some information might be missing, such as words or numbers.
If you've got any installation issue, these can easily be rectified
You'll likely find some errors in your browser console (press F12). Take a screenshot and send them to us at email@example.com, we'd be happy to help. This could be network/firewall related and easily resolved 😀