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What actually happened or you saw: 
 When the sandbox is set to block metro apps or unknown applications, an alert is given that says “application isolated”.
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What you wanted to happen or see: 
 the windows should read “application blocked” or whatever the sandbox is set to (i.e. Blocked, restricted, sandboxed)
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Why you think it is desirable: 
 “Isolated” could make the user think it is being ran sandboxed.
Yes. They are aware of that one.
Thanks for the report.