Well, thanks mates. I've never seen the "card swap failed" message, and I try to be careful not to swap for a card that's already in play (though I did try that once, too

).
Im actually a little gun shy, now. Played last night and was too chicken to cheat after being thrown out on my rear end every time that I've tried. Not sure if I just have really bad luck (and eggs) or if my character is bugged and can't cheat. Either way, I guess I'll be an honest gambling pirate for a while.
Someone mentioned to me in the game (and it seemed to work for him) that if you leave the table before they can inspect the cards, you won't "get caught." But the "leave table" button disappears for me after I swap cards, so I don't know...