After many tries, I found that Scaler 2 could not be activated after its original splash screen was clicked out of the way using the upper right hand “X” on the splash screen.
However, The “Close” button did properly finally activate Scaler 2. This was misleading since “Close” could be interpreted to mean “stop the access to Scaler2”.
I thus recommend a feature change on the splash screen so that the “Close” button be renamed “Close this page and activate scaler 2” or words to that effect.