I found the answer buried in an Amazon forum thread. It seems in their infinite "wisdom", the programmers who make the Kindle OS decided to default the Kindle Silk browser's support for Flash Player to OFF when they released the most recent update. This is one of my pet peeves - stupid default decisions assigned by programmers because "they" think it is a good idea, and it usually prevents device users from actually being able to do what they want to do on the device. Especially when such inane decisions REVERSE the previous default setting, with which users were accustomed and generally satisfied.
So we can now run the Facebook Scrabble game. The $4.99 Scrabble you can download works too, but it doesn't log into Facebook, so my wife can't play with her friends as easily. Each of them would also have to BUY the download.
Hmm. I sense a hidden agenda here.........