Glad you figured it out. And like was indicated it wasn’t really the My Cloud’s fault rather at some point the PC #2 Network Name/Workgroup Name got changed on your end. Most times the average user doesn’t even know about that setting or need to change it from the default (workgroup) that is set when Windows is installed/configured/setup or they buy a brand new PC.
It should be noted I suggested checking to make sure both the PC and the My Cloud were using the same name (workgroup) in one of your other threads yesterday… 
http://wdstagingsplit.staged-by-discourse.com/t/new-to-mycloud/188953/8
