Anyway, we are indeed still in a testing phase. I have only upvoted a few posts to start the system, but it appears that some of those people are unable to vote up any other posts, even though they should now be able to. Secondly, mods who should always be able to vote cannot either at the moment.
Of course, the above things will be fixed first before more voting is done.
I do also want to point out that, because it is just me voting (since there's a flaw somewhere), I may have missed valuable posts. And even more importantly, I'm voting on valuable POSTS, not because of the members who posted them. The result of upvotes on valuable posts is the user's reputation, not the other way around. That is also why you need a rep>0 to be able to vote.