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CCSV5.1 - no Expressions window functionality (Asynchronous viewer input update)

Using CCS v5.1.08020, I keep getting a popup error that says "Asychronous viewer input update", each time launch my configuration.  And I believe it is the reason why I cannot see or add anything to the Expressions window (a crucial, needed functionality).  I momentarily see something in the Expressions window, before it clears and the pop-up appears

Please advise,

Robert

 

Here is the pop-up: