'piwik_ignore' cookie doesn't exclude my visits

I updated to Piwik 1.7.1 and trying to exclude my visits whit the ‘piwik_ignore’ cookie.
But all my attempts fail.

I set the cookie both:
[ul]
[li] Settings > User settings > Exclude your visits using a cookie > Click here to set a cookie…
[/li][li] placing the opt-out iframe in html page and clicking Opt-out checkbox.
[/li][/ul]

The same cookie is created:


Name:	 piwik_ignore
Content: ignore%3DczoxOiIqIjs%3D%3A_%3D61b3fde511c1c1112d5787158016eb3400262326
Domain:	 www.michelesalvador.it
Path: 	 /piwik/  (in Firefox)   -  /piwik (in Chrome)
For:   	 Any connection
Expires: Monday 26 May 2014 20:48:15

I also tried to:
[ul]
[li] set the same cookie with javascript
[/li][li] change the path fom “/piwik” to “/”
[/li][li] used the not-encoded value “ignore=czoxOiIqIjs=:_=61b3fde511c1c1112d5787158016eb3400262326”
[/li][/ul]
BUT my visits are always tracked: they immediately appear in Visitor Log.
The same problem happens with IE, Firefox and Chrome.
In previous Piwik version exclusion worked fine.

Please help. Thank you

because your tracking code points to
http://michelesalvador.it/piwik/
and thats a different domain than www.michelesalvador.it

thanks Thomas, you saved my life.
back to trust Piwik!