Hi faf, thanks for your reply.
I use version 2.2.0
I never changed the code of the button. I did it recently, I tried it but still does not indicate the previous visits.
You have months that does not work, I think more than a year, I got used to it but in fact I see it very useful, so my concern.
I just tried (with the change of the code of the button), to enter, to leave and after a while to re-enter. The system takes me as a new visitor (..... visitor =).