Thanks Rich for the feedback.   Do you have any advice or experience about what value to use for the Maximum Server Connections?   Or is there any rule-of-thumb to follow when picking a value?

I accidentally had the enableToggleSelect property set to true - which was couteracting the second click of the double-click.   Once I got rid of that property it worked as expected.

Hello to all.  You can disregard this post.  I found the solution/answer myself through more research/debugging.