For some reason I only see the down arrow on some of the posts... again not sure exactly how the internal mechanism for that works.
Thanks. (Not that I intend to vote anyone down :)
Update: Looking through some of the other threads, it seems that I can't vote down on comments older than a certain age. (Offhand I would guess this was when I got the 20th point of karma.) So I guess it does kind of make sense.
Actually, it seems that I just can't vote down on any comment older than 24 hours. Even it is related to when I got the karma, it is also limited by the age of the post as well. Not that it really matters, just thought I'd post what I see.
And again, if anyone could post what is actually going on here, I wouldn't have to make guesses.