Registered users cannot edit after MediaWiki update

[McoreD]

Hi All fellow WikiSysOps,

Has anybody come up with this error:

Sorry! We could not process your edit due to a loss of session data. Please try again. If it still doesn't work, try logging out and logging back in.

After upgrading MediaWiki from v1.5.2 to v1.6.8 this is the error I get while trying to Save Page for a registered user. Surprisingly guests can edit and save. I then upgraded to v1.7.2 but still get the same error. I really need help. Is there some protection setting in LocalSettings.php or somewhere to turn off?

Please advice.

Thanks in advance,
McoreD

[McoreD]

Thanks heaps to martlume

Edited php.ini via http://members.powweb.com/member/cgiManagement/PHPplus.bml

From
;session.save_path = "/tmp"

To
;session.save_path = "/home/users/web/b2357/pow.y2kyan04/tmp"

Now all works. :)