The Like heart is fixed (theme 0.5.288). It only worked on the home page. On a single-post page or a profile page, clicking it looked dead -- but it was actually toggling your like on the server with no feedback, which is why likes seemed to come and go at random. Scott Hanson's report (works on home, not on a single-post page) gave away the pattern. Now the heart fills in and the count updates in every view. If a Like of yours went missing this week, that was the bug -- please try again.