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Why can issue this error in the log?
2014-10-16T09:48:55+00:00 ERR (3): User Notice: 'hashed_directory_umask' is deprecated -> please use 'hashed_directory_perm' instead in /var/www/html/magento/lib/Zend/Cache/Backend/File.php on line 144
The error says, your PHP version is too new, please use the new PHP function hashed_directory_perm instead of the old one hashed_directory_umask.
I'm sure this is fixed in later Zend versions, so update magento or Zend and this problem is fixed.