I'm not sure if this is still the case, but I've noticed several times that an up-vote or a down-vote gets locked in (after 5 hours or something). Does the same thing happen with "accept"s as well?
Anyhoo, I fail to see the logic behind this. Many times, I've been convinced prematurely by an answer or misinterpreted an answer so that I vote it the wrong way. I come back 5 hours later only to realize I can't change my opinion of the answer. What's the rationale behind having this lock-in time? Wouldn't it be a lot better to not have it at all?
Not a big issue really, but it would be neater to have "correct" answers at least look like they're popular.