In a game I clicked too quickly on a card after playing church the previous turn. That left me in a state where I could "confirm delete" but not either select a different card or not delete at all. (Running Chrome on Windows 10 on a big screen)
Thanks, there seems to be a problem with the "Confirm single Trash,..." option that has this effect on a few cards.
This problem (with other "Confirm Single click" problems) has been fixed.