In treo 650 contact, when I input one letter like "H", it will NOT automatically bring up contact started with "H"?? But if I type "Ho", it will scroll to contact with "Ho" immediately! WHY?

Now I find out: If I disable CJKOS 4.63, it will show up perfectly even with one letter!!! Anyone has the same problem?? Any solution? (plz don't tell me delete cjkos.......)