I guess it will be a good idea to continue this thread here: https://community.magento.com/t5/Magento-1-x-Technical-Issues/Suspect-file-in-Magento-1-9-0-1/m-p/10... :-)
sure here the error>>>
Exception message: Invalid method Mage_Customer_Model_Customer::cleanPasswordsValidationData(Array ( ) ) Trace: #0 /home/cdqkqjkb/public_html/app/code/core/Mage/Customer/controllers/AccountController.php(821): Varien_Object->__call('cleanPasswordsV...', Array) #1 /home/cdqkqjkb/public_html/app/code/core/Mage/Customer/controllers/AccountController.php(821): Mage_Customer_Model_Customer->cleanPasswordsValidationData() #2 /home/cdqkqjkb/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Customer_AccountController->resetPasswordPostAction() #3 /home/cdqkqjkb/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('resetpasswordpo...') #4 /home/cdqkqjkb/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #5 /home/cdqkqjkb/public_html/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch() #6 /home/cdqkqjkb/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array) #7 /home/cdqkqjkb/public_html/index.php(102): Mage::run('', 'store') #8 {main}