I uninstalled the Catalyst driver and the dialog worked correctly under the open source driver (which unfortunately is unsatisfactory for other reasons, including available screen resolutions). When I reinstalled the Catalyst driver, the problem came back.
I uninstalled the Catalyst driver and the dialog worked correctly under the open source driver (which unfortunately is unsatisfactory for other reasons, including available screen resolutions). When I reinstalled the Catalyst driver, the problem came back.