The button you refer to controls whether played cards disappear or are greyed out. I have it turned on, so played cards are greyed out. This is OK against a white background, but as the background for dummy is grey they effectively disappear. I have now discovered that I can change the background for dummy to white and the greyed out cards consequently become visible. However, that background change does not last across sessions, so perhaps that is the question I should really be asking. That is, why does this background change only last for the current session? ang