Yes, UI Builder shares a lot of the same code as the game engine for rendering the UI elements. But it sounds like the latest version of UI builder did not get patched with beta and thats why it can't load the Persona window.
Unfortunately we could not patch out the new UI Builder prior to shipping RoK, because it would generate invalid xml files that the game wouldn't be able to read. Since they need to stay in sync, you'll get the new UI Builder when RoK is patched down.
|