hidrefer does not work all the time

i noticed the last couple of weeks that hiderefer does not work all the time. so if you are posting sensitive links try to use some cpa redirector or something in addition to that. i noticed this because when i hover over the link in my signature it does not always show the "hiderefer" part and if you click on it it does not always work.



look at this:

99.68.127.92 2010-03-19 20:00:37
/about/?mn=123
Referrer: http://www.blackhatworld.com/bla(...)kill-their-self-all-changes.html
Hostname: adsl-99-68-127-92.dsl.yntwoh.sbcglobal.net

* User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)

* us OS: WinXP
* BROWSER: Firefox 3.5

* 19:57:19 ->/about/
* 19:57:20 ->/about/
* 20:00:31 ->/wp-login.php?redirect_t

I actually noticed this quite a few times in my googl analytics. Maybe the user clicking on the external link is using some plugin which in turn does not remove the true referer information.