Yeah, make sure your signature is less than 512 Characters. Not Words, characters. Also, on selecting SAVE CHANGES, it should say that YOUR CHANGES HAVE BEEN SUCCESFULLY SAVED! If not, your signature will not appear.
Sorry I didn't catch this until now...! I've gone ahead and marked your signature as Not Spam. The automatic spam filter has gotten a little overzealous lately, which we are looking into a fix for. If ever you run into a situation where signatures are not showing up, just ask a moderator or admin that is on (or post in the Bug Reports forum) so it will be taken care of.