Whenever I navigate to another set of puzzles than the one for the current date using the orange calendar icon, the date in bold type duly changes and the desired set of puzzle appears. But what also appears is a small icon showing a four-cell puzzle that obscures the calendar icon so that I can't navigate directly to the set of puzzles for yet another non-current date. Instead, I have to click the yellow-background Today link (or hit the browser's Back button) to get back to the current-date view, in which the calendar icon is not obscured, so that I can use the calendar again. (It doesn't matter if I'm logged in or not.)