ReadyCLOUD Desktop Client shows device offline

Problem now fixed by Daniel in Netgear Support as follows;

Solution part 1: Removing User Conflicts.

Cloud users and local users cannot share the same name or email address.
We edited your local user and removed the email address, which was used on as the name on your cloud account.

Solution Part 2: Restarting the Service.

Last year (firmware 6.5.0), we upgraded ReadyCloud. You had upgraded your account correctly, but we could see in the Cloud tab of your ReadyNAS that it was still linked to the old username, rather than the account's email address.

There was a few things we could do here, but as you were not using the readycloud home folders, the quickest solution was to click the Leave button and to re-enter your details.

ReadyCloud now operating on W7 and W10 machines.