NIS v21 and Threat Detections

I installed the new version of NIS on Tuesday.  Since then I've gotten "threat detections" both days on the Performance screen.  When I click "view details", I'm taken to the "Resolved Security Risks" screen, but no threats are shown.  With NIS 20, the threats were always displayed.  

 

Screen Shots:

 

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Resolved Security Risks