Disabling and re-enabling stops the Twonky service and restarts it, which rebuilds the Sharing settings in the Twonky configuration file. This is a third level of severity of restarts, but one I forgot to include in my FAQ. I’ll change it, thanks.
http://community.wd.com/t5/WD-My-Cloud/FAQ-Twonky-DLNA-Media-Server-Setup-amp-Use/m-p/858813