Problem with sessions

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I am having problems at the moment with the current version of concrete5.

I have installed the system successfully and everything seems to be working.

But now I have twice faced the problem that concrete5 has a duplicate sessions with some other user. According to my host the session name is same with another user on the server.

I get the following error message when viewing the site:
Warning: session_start() [function.session-start]: open(/tmp/sess_88d5fd89fed7c27d6a9489de88598f6b, O_RDWR) failed: Permission denied (13) in /home/public_html/concrete/startup/session.php on line 18
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/public_html/concrete/startup/session.php:18) in /home/public_html/concrete/startup/session.php on line 18
Warning: Cannot modify header information - headers already sent by (output started at /home/public_html/concrete/startup/session.php:18) in /home/public_html/concrete/libraries/view.php on line 764


My host suggested that I should try changing the save path for the temp files. I noticed that there is a commented line in sessions.php:
/* ini_set('session.save_path', DIR_SESSIONS); */


Do you have any other suggestion how to resolve this issue or what would be the best method to change the session path?

Hypocrite