Piwik 2.0.3 - dbtable session not working on PHP 5.4.23? (no replies)

Hi

I have just completed a fresh install of Piwik 2.0.3 using session_save_handler=dbtable (because we are using NFS root-dir) on a PHP 5.4.23/mysql-server-5.5.31 on CentOS 6.3 infrastructure.

I cannot access PIWIK due to the following error that turns out already at login:

Warning: session_write_close(): Failed to write session data (user). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in /var/www/publics/analytics.xxxxxxx.co/libs/Zend/Session.php on line 691

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [:]
#1 session_write_close(...) called at [/var/www/publics/analytics.xxxxxxx.co/libs/Zend/Session.php:691]
#2 Zend_Session::writeClose(...) called at [:]

I did some further testing:
- The same installation works perfectly when using session_save_handler="files";
- I tried a new fresh install of the same Piwik 2.0.3 on a php-5.3.3/mysql-server-5.1.71 and it works perfectly both using dbtable and file as a session handler.

I would guess there is something related with php 5.4 but I could not figure it out.
If you have any idea, help will be appreciated.

Thanks
Gianluca