change the cell's focus in JTable, the input status sometime will change disable

jdk1.3.1_01, zh_TW.BIG5

want to input some locale char in JTable,
first use <ctrl>+<C> to enable tch input method, then change to another cell in th JTable, the input status will not disapear, you can input the locale char again, but sometimes the input status will change to disable and user counldn't input any char then.