Help! can't store ja16sjis to nvarchar2 column.

hi:
I am using Oracle8.1.7.
And NLS_CHARACTERSET=UTF8 ,
NLS_NCHAR_CHARACTERSET=JA16SJIS ,
I can store sjis code into varchar2 column,
but when store into nvarchar2 column, all the code
are converted into USASCII7. many '?' there.
I use
insert into test values('xxx')
to insert into varchar2 column.
and use
insert into test values(N'xxx')
to insert into nvarchar2 column.
where's the problem?
NLS_LANG=japanese_japan.ja16sjis
NLS_NCHAR=japanese_japan.ja16sjis.
Thanks inadvance.
null

Thanks for the suggestion.....
But I am confused about what you mean by "starting over and using a new icon".
BTW, I had not done anything w/ the icon in the first place.
Still confused

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