PHP 5.2.14 on Windows
Exception: Test_Piwik_TrackerAction -> test_extractUrlAndActionNameFromRequest -> Unexpected PHP error [htmlspecialchars() [<a href='function.htmlspecialchars'>function.htmlspecialchars</a>]: Invalid multibyte sequence in argument] severity [E_WARNING] in [C:\inetpub\wwwroot\trunk\core\Common.php line 613]
(In [4315]) fixes #2266 - suppress E_WARNING on php 5.2.14 with invalid UTF-8