One option is to activate SSH through the My Cloud Dashboard, then access SSH and search through the /DataVolume/shares directory for your missing Share (or missing files). There are various programs like Putty or WinSCP that can be used to access the My Cloud using SSH. By using SSH one will access the My Cloud at the root/firmware level and may be able find Shares that are there but for what ever reason are not being displayed properly by Samba/AFP.
There was another recent thread where using various SSH commands were used to find Shares and their size. One can review that discussion to learn some of the relevant commands that may help them search the /DataVolume/shares folder for their missing content.
http://community.wd.com/t/my-cloud-4tb-is-full-can-not-free-up-space/192273/
Otherwise you may want to contact WD Support directly and speak to WD directly. This forum is generally a user to user support forum.
