For the benefit of others who may be following this topic, the 02.03 image was reloaded and a RESET done. The Devices.xml file uploaded, Areas recreated with devices assigned to the Areas. The X10 devices are now controllable from the HTML and Flex client interfaces.
Whatever corrupted the password seems to have also done something that prevented the WriteCluster command used by the Flex client from working. The reload of the 02.03 image and RESET resolved the WriteCluster command failure.