Turn it several times until t clicks, it is a little tricky but eventually youll get it everytime. Also, portrait only works when the game is on, not the menu.
Personally, I've played a lot less on iPad since they screwed up the interface. I don't plan to buy another table (on any platform) until they fix it so we can have portrait mode.
I thought the original interface was OK. Was it somehow too labour-intensive to add each new table to that style?
We should have been left with the regular interface, instead of giving us a halfway done attempt. Not buying anything either.