I have installed this plugin and followed the instructions as is, however, I too face the same issue as above.
It comes up with one question:
Out of a rose, novel, dog, table, piano, or automobile, which is most likely to have teeth?
after answering the question with right answer, it does not go forward or the submit process does not complete. it gets stuck there.
i tried to refresh the page, it comes up with same question and it is stuck.
Currently, the spammers are unable to register and hence free from the spam registrations.
Anyone know why this spammers are registering ?