I have an answer with 10 up-votes on programmers.stackexchange.com, but my reputation is still stuck at 101 (for linking my accounts across other Stack* sites). Shouldn't my reputation be increasing for each up-vote I get?
It's a "Community Wiki" answer (one which doesn't have a permanent "owner", can be edited by more users, and doesn't grant reputation to anyone) - this status is forced for answers to questions with more than 30 answers. On the other sites, this is done to try and reduce the motivation for posting duplicate answers on open-ended questions...
For this site, there's some discussion as to whether it's a useful behavior.