Cannot log into dashboard or share

I’ve been happily using my WD MyCloud for a few months, I normally connect to it using Windows (7) Explorer and have mapped my personal share to a drive letter so all appears to be working as it should - I can see the mapped drive and can access all the shares where the MyCloud appears under ‘network’.

However, I just tried to connect to my share on a spare computer on the same network and I can’t log into it. I then tried logging into the dashboard from my main computer, I see the login page as usual but it won’t take any of the passwords I’ve tried.

I know the username is correct as my computer defaulted to it, and I had even made a note of the password as I have an awful memory but nothing works. I have no recollection of re-mapping the share so I’m sure I haven’t changed the password and if I did I would have updated my note. I then tried logging in with my wife’s and the admin accounts and neither of those work either so I’m stuck.

I thought about rebooting the MyCloud but I can’t access the dashboard to do it “nicely” and pulling the power plug is more of a last resort, although I know it’s relatively OK to do.

I still have access to it in Windows Explorer so at worst case I can back it all up and start again but it’s bothering me that I can’t log in.

Could this be a problem at WD, given that I can access it locally but can’t log into the dashboard? Although that doesn’t explain why I couldn’t connect to it via the spare computer or that the Android app is still working.

Any ideas or suggestions would be most welcome!

What are you seeing when it ask you to sign in? Is it one of these, see images below, if it is have you tried your network name and password?