Cant Rematch??

I love this game and have been playing it for years now! I have 3 games all the time going with one of the first people I ever played, but now, I cant invite that person or anyone in particular anymore to play? Why?! Am I missing something? Help! Want to keep the same challenges and new ones. Advise?

MammaCat! about Gin Rummy HD - The Best Online Card Game!, v2.2.3