When you bring up the FF14 launcher, look on the bottom of it and to the right. You should see "Config" click on "backup" and save the file someplace you will remember where it is, then click on it then click on "Reset". This will reset all the settings back to there defaults. If you are still having the problem after you have try what Raist has posted and try resetting all the settings to the defaults then try updating you video card driver or reinstalling it or uninstall the game and reinstall it.