first of all, i'm on a macbook with osx 10.5.8 i think the problem usually happens when i navigate to korean webpages, actually. but not only then. for example, when i googled 'firefox help,' my korean keyboard option was grayed out. but right now, it's available. i noticed that sometimes when i go to a korean site, the keyboard automatically changes to korean (this didn't happen before upgrading to ff4). however, when i try to type something, a new window appears at the bottom of the screen with my korean characters in it. i can't do anything with the characters (like copy/paste) and only 1 or 2 show up anyway (if i keep typing, they automatically overwrite the previous chars). i haven't noticed the problem in any programs other than firefox.