Since the last AppBuilder release there were some authentication matters that could have provoked the faulty behavior on your side. You can check the incident report here
. However, as I can see the time of submitting the ticket, most likely they are not the case, as everything was already fixed and working then.
Further, there was also a DDoS attack on the Rackspace DNS servers, for which you can find more here
. It affected not a small part of the Telerik web infrastructure, resulting with unreachable sites or failing authentication. Still, the attack seems to had happened after your report.
I cannot think of any other incident the past days that could have caused such faulty behavior on your side. That's why I will kindly ask you, if you can send us the AppBuilder logs from %localappdata%\Telerik\BlackDragon\Logs
. You should be able to attach them as an archive with your next reply. I am looking forward to it.
Also, I assure you that we have a strict workflow for updating our clients about ongoing incidents on our status page
. However, in a lot of cases our clients are the ones that report such matters, even before the AppBuilder monitoring. This could lead to small delays, that we will definitely consider improving in the future.