No referrer links on wordpress blog

For about one month now statcounter shows no langer referrer links .
I tried to find a solution by changing the theme and repairing the code but nothing helps. HELP !
Your blog's using https? That will kill the referrer information - which is what the visited url is when you use the html-only version, which is just an image.

Not sure if the https version of the tracker would help, but I also think you need to upgrade to use it.