I have few errors after upgrade to 1.9, each of them reffering to the same problem in hostname.php:
Notice: iconv_strlen(): Unknown error (0) in /cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Validate/Hostname.php on line 619
Backtrace -->
#0 Piwik_ErrorHandler(…) called at [:]
#1 iconv_strlen(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Validate/Hostname.php:619]
#2 Zend_Validate_Hostname->isValid(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Uri/Http.php:445]
#3 Zend_Uri_Http->validateHost(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Uri/Http.php:277]
#4 Zend_Uri_Http->valid(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Uri/Http.php:154]
#5 Zend_Uri_Http->__construct(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Uri.php:145]
#6 Zend_Uri::factory(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Http/Client.php:305]
#7 Zend_Http_Client->setUri(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/libs/Zend/Feed.php:170]
#8 Zend_Feed::import(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/plugins/ExampleRssWidget/ExampleRssWidget.php:120]
#9 Piwik_ExampleRssWidget_Rss->get(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/plugins/ExampleRssWidget/ExampleRssWidget.php:66]
#10 Piwik_ExampleRssWidget_Controller->rssPiwik(…) called at [:]
#11 call_user_func_array(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/core/FrontController.php:138]
#12 Piwik_FrontController->dispatch(…) called at [/cpanel/home/CLAUDIU2/fotografiistudio.com/piwik/index.php:53]