my sugar version is 5.2c CE,webservice is apache2.2 and os is windows2003,php version is 5.2.92

I can not save subpanel layout! I Drag and Drop subpanel to ordering,but,refresh the detail page,the order is recovering.

I find that ：
when modified subapnel layout at first time，system insert into user_preferences a record，when I installed Chinese Language Package，saving layout,there is a error in sugarcrm.log:

07/23/09 03:53:01 [3020][1][INFO] Save: INSERT into user_preferences set id='5ba9502a-cc68-a70a-64fa-4a67dee1567b', category='Project:所有', deleted='0', date_entered='2009-07-23 03:53:01', date_modified='2009-07-23 03:53:01', assigned_user_id='1', contents='YToxOntzOjE0OiJzdWJwYW5lbExheW91dCI7YTo5 OntpOjA7czoxMDoiYWN0aXZpdGllcyI7aToxO3M6MTE6InByb2 plY3R0YXNrIjtpOjI7czo3OiJoaXN0b3J5IjtpOjM7czo4OiJj b250YWN0cyI7aTo0O3M6ODoiYWNjb3VudHMiO2k6NTtzOjEzOi JvcHBvcnR1bml0aWVzIjtpOjY7czo1OiJjYXNlcyI7aTo3O3M6 NDoiYnVncyI7aTo4O3M6MTQ6InNlY3VyaXR5Z3JvdXBzIjt9fQ =='
07/23/09 03:53:01 [3020][1][INFO] Query:INSERT into user_preferences set id='5ba9502a-cc68-a70a-64fa-4a67dee1567b', category='Project:所有', deleted='0', date_entered='2009-07-23 03:53:01', date_modified='2009-07-23 03:53:01', assigned_user_id='1', contents='YToxOntzOjE0OiJzdWJwYW5lbExheW91dCI7YTo5 OntpOjA7czoxMDoiYWN0aXZpdGllcyI7aToxO3M6MTE6InByb2 plY3R0YXNrIjtpOjI7czo3OiJoaXN0b3J5IjtpOjM7czo4OiJj b250YWN0cyI7aTo0O3M6ODoiYWNjb3VudHMiO2k6NTtzOjEzOi JvcHBvcnR1bml0aWVzIjtpOjY7czo1OiJjYXNlcyI7aTo3O3M6 NDoiYnVncyI7aTo4O3M6MTQ6InNlY3VyaXR5Z3JvdXBzIjt9fQ =='
07/23/09 03:53:01 [3020][1][INFO] Query Execution Time:0.000640869140625
07/23/09 03:53:01 [3020][1][FATAL] MySQL error 1366: Incorrect string value: '\xCB\xF9\xD3\xD0' for column 'category' at row 1

If I use English(US) ,it is OK:
Insert: INSERT into user_preferences set id='9bc4604c-539c-d151-c100-4a67dde5bdc3', category='Opportunities', deleted='0', date_entered='2009-07-23 03:49:03', date_modified='2009-07-23 03:49:03', assigned_user_id='1', contents='YToxOntzOjE0OiJzdWJwYW5lbExheW91dCI7YTo2 OntpOjA7czo3OiJoaXN0b3J5IjtpOjE7czoxMDoiYWN0aXZpdG llcyI7aToyO3M6NToibGVhZHMiO2k6MztzOjg6ImNvbnRhY3Rz IjtpOjQ7czo3OiJwcm9qZWN0IjtpOjU7czoxNDoic2VjdXJpdH lncm91cHMiO319'
07/23/09 03:49:03 [3020][1][INFO] Save: INSERT into user_preferences set id='9bc4604c-539c-d151-c100-4a67dde5bdc3', category='Opportunities', deleted='0', date_entered='2009-07-23 03:49:03', date_modified='2009-07-23 03:49:03', assigned_user_id='1', contents='YToxOntzOjE0OiJzdWJwYW5lbExheW91dCI7YTo2 OntpOjA7czo3OiJoaXN0b3J5IjtpOjE7czoxMDoiYWN0aXZpdG llcyI7aToyO3M6NToibGVhZHMiO2k6MztzOjg6ImNvbnRhY3Rz IjtpOjQ7czo3OiJwcm9qZWN0IjtpOjU7czoxNDoic2VjdXJpdH lncm91cHMiO319'
07/23/09 03:49:03 [3020][1][INFO] Query:INSERT into user_preferences set id='9bc4604c-539c-d151-c100-4a67dde5bdc3', category='Opportunities', deleted='0', date_entered='2009-07-23 03:49:03', date_modified='2009-07-23 03:49:03', assigned_user_id='1', contents='YToxOntzOjE0OiJzdWJwYW5lbExheW91dCI7YTo2 OntpOjA7czo3OiJoaXN0b3J5IjtpOjE7czoxMDoiYWN0aXZpdG llcyI7aToyO3M6NToibGVhZHMiO2k6MztzOjg6ImNvbnRhY3Rz IjtpOjQ7czo3OiJwcm9qZWN0IjtpOjU7czoxNDoic2VjdXJpdH lncm91cHMiO319'

what is the reason?
thanks