Can anyone else using Windows confirm having these problems? Switching lesson status works for me with Firefox and Safari no problem. iPad works as well, although it requires a double-tap on the links in the lesson lists.

Just to comment on the deletion functionality -- right now it is possible to delete lessons from your account in two ways: (1) using the checkboxes on the lesson archive page to remove an entire series, or (2) scroll back through the front page and click on the "close" button that appears on the teaser/intro for individual lessons.