i am fairly new mac user. i bought this imac in May and set it up, so that i can type in japanese.

it was working fine until last weekend. usually, i just use english keyboard layout to type in japanse (type "sushi" to get sushi in japanese), but now keyboard layout is off. when i type "sushi" in japanese mode it shows typed as "ogodc" when it should be "sushi". i am not sure what happened. the conversion itself works. when i type S on the keyboard, it acts as if i typed O (which is wrong), and it shows as O in japanese (which is correct).

when i go to international language setting, i can see the input type as "keyboard" for US, but "input method" for japanese.

i could not find anything in documents provided by apple.

does anybody have an idea what happened or where i should go?