We are deeply sorry for the inconvenience you have experienced.
There was a temporary outage of the Telerik Platform services which was causing the reported behavior for a subset of our customers as reported on our status page here. The Telerik team has been able to identify the issue and stabilize the environment. If the problem persists, please, clear your browser cache and cookies and try again. Should you experience any other unexpected downtime, don't hesitate to let us know.