Is there any way to make my deck selection permanent, rather than select again each time I log in?
The checkboxes in the deck menu indicate the set of card backs that we will choose randomly from. If you only have one back checked then we will always choose that one. If all are unchecked then we will choose randomly from all of them. We store your selection in a cookie. If you clear your cookies or use a different browser, then you will lose your choice.
Hope that helps.