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were you able to solve this? If not, can you check your PHP version?
This seems to be a bug in PHP 5.4.x, try updating at least to 5.4.11.
More info:
https://github.com/concrete5/concrete5-5.7.0/issues/1110...
http://stackoverflow.com/questions/18381544/sessionhandlerwrite-par...
Regards,
Jordi