Is anybody else having the following error while in admin pages?
WARNING CoreHome[2015-03-02 14:41:23] [202a2] C:\wamp\www\piwik\core\Url.php(252): Warning - preg_match(): Unknown modifier 'p' - Piwik 2.11.0 - Please report this message in the Piwik forums: http://forum.piwik.org (please do a search first as it might have been reported already)