I see posts relating to this but I can not comment on them, so here goes.
Every now and again I get the authentication error asking for user name and pass word. I enter it and it says access denied see admin or something like that.
The only 2 ways I get acces after that are these;
1: I go to WDMYCLOUD and then click users. Click on a profile, click password off let it update then turn it back on and let it update again. Then I can access my shares.
2: Go to MYCLOUD click shares. highlight the user having trouble in user acces and change a share to read only, let it update and then back to full acces and let update again.
Both these seem to fix the auterisation issue for a short time.
Apart from these actions I have no other way to get to my shares sometimes. I thenk WD knows they have an issue but can not find a solution so ignoring tickets about it.
Hope this helps at least a bit.