Fail when starting PHP5-FPM

I have upgraded to Ubuntu 12.10 from 12.04 and now PHP5-FPM fails to start. The error I get when I run /etc/init.d/php5-fpm start is fail. There is nothing being written to log files to give me an indication of what is wrong.

As much as I want to solve this, at this stage I really just want something printed to a log file to give me a clue. This is what I have configured in /etc/php5/fpm/pool.d/www.conf:

php_admin_value[error_log] = /var/log/fpm-php.www.logphp_admin_flag[log_errors] = on

However this log file is never being written to.

I am running PHP5-fpm version 5.4.9.

Can anyone give me some suggestions?