Found a bug where if you login on a save you have already voted on and try to vote it will display the error ? or O.
(the vote button does not get updated when you login)
Confirmed. The error box displaying garbage is a different bug; good job catching two at once! :P
EDIT: This is not going to be fixed because it's so minor, but I've fixed the error message so that'll start working in the next snapshot.
Error messages fixed in snapshot 175 (which is now out).