Just finished a support call with Avast/AVG concerning this situation. According to the tech, if you only use the following URL in place of what pops up in window (regardless of browser), it will take you to the proper screen so you can then access your client's data. In essence, when the login screen pops up, delete everything back to what you see below. I've verified that this works as I was able to properly access my clients cloud backup data. Hope this helps.