Looks like the "so-and-so likes this post" badge isn't showing up on posts where the user did not include his/her signature when posting.

Here is an example post that got liked but no badge: http://www.zombiepodcast.com/forum/s...6026#post56026 (Listed in my Likes/Thanks as being thumbed up by another user)

Example #2: http://www.zombiepodcast.com/forum/s...6023#post56023 (same deal)