Cake PHP session does not work

I made some system for my customer with CakePHP 1.3.6.
It worked as we planned on the test server but it go wrong on the
customer's server.

1. Session does not work.
2. Some garbaged character is shown one moment and after then it is
shown precisely.
That system is in Japanese.
It seems one moment it is shown in Shift_JIS and then redirect to
UTF-8.
3. Redirect does not work because "header is already sent" error.

PHP version is 5.2.17.
The difference of the test server and customer's server is that PHP is
CGI mode one the customer's server.

I am sorry that I can not show url of the system because of the NDA
with customer.

Any information is appreciated.

Thanks.

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