As I checked this problem, it happened on DCS website only. And I tried to fix this problem many solutions (Clear cookies, Reset add-on, Reset security, Reset IE setting, etc.) but still cannot fix it. So, I will try to do again on next week (around Wednesday or Thursday). Because Captain Suppachai need go to seminar out of office.
Also, I will do Ticket ##428316## for Captain Suppachai in the same time also, if I can solve this problem successfully.