Can't vote any more

After casting a couple of votes without any problem the system now denies any voting on questions and answers with a little popup saying (literally with all the tags visible):

You don't have permission to do this action. Please <a href="/users/login.html">Login</a> as another user

A bug? Are there any restrictions? Coming from stackoverflow I am used to vote as I like.

Thanks Kay

The admins change the amount of Karma required to vote answers up today to 15. It is intentional, and its there to prevent newcomers from voting up things that shouldn’t be voted up.

Let me solve that problem for you…