The problem is that when it ask me sign in to my My Cloud account, when I put my email and pass NOTHING HAPPENS, just a blink and it clears the email & pass boxes and nothing happens! No matter how many times I try, is the same.
My user/email is correct, my pass is correct, I am connected to internet, but nothing.
Cool. That’s the same version I’m running. Could you try fully un-installing the WD Sync client and re-installing it? Also, are you running WD Sync on Windows or Mac OS X?
Cool. Did you reboot between un-installation and re-installation? Also, what anti-virus/anti-malware software are you running? Lastly, in WD Sync, when you enter your email address and password to connect to MyCloud, do you see the “login” (maybe it reads sign-in) link again or do you see that you’re signed in but don’t see your device?