Like other reviewers, I wonder if Granny is receiving random hands. I suspect that Granny needed some help to challenge an expert player, and rather than improving the AI it was easier to juice her hands. Her play is quite predictable, and she makes late knocks that an expert player would never try.
I also observed a couple of annoying bugs. Occasionally the program does not allow you to knock even though your count is under ten. Also, it does always not meld your hand in the most advantageous way.
bridgeguy about Gin Rummy!