I just have voted 37 times and wanted to upvote a new answer but I'm not allowed to do. Message:
Daily vote limit reached I would understand this if the number would be 40, but 37?
The vote limit is a bit more complex than that, but is in the FAQ. You have up to 40 votes per day, but ten are reserved for questions. So you can only upvote up to 30 answers per day. Moreover, you can't just upvote 30 answers followed by 10 questions: once you hit the voting limit on answers, that's it for the day. So you have to be voting in a 'balanced' way, for a mix of questions and answers, to get to 40.