Root Cause: This usually happens when the User Interface is left open for an extended period of time.
This field was added on 30/03/2017. This article has not been updated yet. Refer to the "Description" or "Workaround" sections for solution information.
Fix Status: No Fix
Rebooting the User Interface (UI) should resolve the issue. If the problem persists after rebooting the UI, use the following link and send the generated files to Support:https://ca.my.salesforce.com/articles/Knowledge/ka4b00000004MNi