A comment made by me on 2010-09-28 20:01:56Z on the question http://stackoverflow.com/questions/3816446/how-can-i-safely-average-two-unsigned-ints-in-c received some upvotes. But, I think, they did get not included in my reputation. Is that possible? Is there any kind of log that I can check out?
Now that you have provided some background and a link, it is obvious that you are referring to a comment of yours rather than an answer.
While you do get reputation for upvotes on your answers (and questions), upvotes on your comments do not gain you any rep, ever. As Grace Note mentioned, there is a comment voting FAQ, where it is expressly stated that: