For example, you start a document in a Cocoa text application using the English input method. You type some English text. You switch to a Korean input method and type some more text. All the text appears the way you'd expect--English in an English font and Korean in a Korean font. Then you switch back to the English input method and type more, but the new text is still in a Korean font.
To fix this, select the text to be changed, then use the application's Font menu (or Show Fonts menu choice in a differently-named menu) to change the font to what it should be.
To avoid this, use a Mac OS X "Carbon" application that doesn't experience this issue. You could, for example, type a document in one of these applications, then copy and paste the text into your Mac OS X application.
Tip: WorldText, a Carbon application, is available on the Developer Tools CD that came with your computer and with Mac OS X software installation discs.
This document will be updated as more information becomes available.