Why can I disable font smoothing for the standard font of the Mac OS X user interface?
Depending on operating system version, Mac OS X may or may not be capable of changing font smoothing settings for the font “Lucida Grande”, the default font used in most Mac OS X dialog windows. This problem is not restricted to TinkerTool: Apple’s original System Preferences application shows the same problem if you are changing the font smoothing limit in the Appearance preference pane. We made Apple aware of this issue, but they don’t plan to fix it.