I am seeing the same issue as described here: http://community.wd.com/t5/WD-My-Cloud/Can-t-connect-to-MyCloud-from-Mac-OSx-10-9-3/td-p/741896
I setup WD My Cloud just fine, moved all my Lightroom photos over and all was well. Now that I have updated to OSX 10.10.1, I can no longer connect to any of the folders via the finder.
I can still access the folders with the installed WD My Cloud App. Any ideas here?