after patch done, i tried to edit the graphic setting in ffxivconfig.exe, then i've kept getting error when i tried to click OK.
then search on google for the solution and search withing the past week results because it happened after the patch and found the simple solution on gamespot.
here is how to fix it
go to ffxivconfig.exe, firstly go to FONT SETTINGS, TICK the "Use Windows System font", then you will see in the first option there is "FONT", the value will be BLANK, this is actually the culprit of the problem. Select ANY FONT from the drop down list then click OK. this time it will ask you to SAVE. click YES (Hell yes!)
then open ffxivconfig.exe again, go to the FONT SETTING tab again, and UNTICK the "Use windows system font". Now you will be able to change the graphic settings.
once again, thanks to the guys in gamespot.