def METHOD_NAME(root):
    """
    Returns a string warning message if the Tk version in use appears to
    be one known to cause problems with IDLE.
    1. Apple Cocoa-based Tk 8.5.7 shipped with Mac OS X 10.6 is unusable.
    2. Apple Cocoa-based Tk 8.5.9 in OS X 10.7 and 10.8 is better but
        can still crash unexpectedly.
    """
    if (runningAsOSXApp() and
            ('AppKit' in root.tk.call('winfo', 'server', '.')) ):
        patchlevel = root.tk.call('info', 'patchlevel')
        if patchlevel not in ('8.5.7', '8.5.9'):
            return False
        return (r"WARNING: The version of Tcl/Tk ({0}) in use may"
                r" be unstable.\n"
                r"Visit http://www.python.org/download/mac/tcltk/"
                r" for current information.".format(patchlevel))
    else:
        return False