Thank goodness someone else is seeing this problem. I have been experiencing it for a few days now. I have been receiving authorization failures on an Outlook add-in using .NET and my GDT calendar gadget. Both are sending me replies that authentication failed. I knew my user ID and password were correct. I changed my password, but that did not help. I even logged into another account and received the same problem. A colleague tried the same tests in another state and everything worked fine. The only differences that I could detect was that his UID was his gmail ID and mine was my e-mail address and he is located in a different state possibly served by different servers with a different version of the API.

I tried to authenticate myself and get a token just to retrieve my calendars and add an appointment. Both failed. The only way I can view my calendar is to open Firefox and view it. GDT and Outlook are useless because of this issue. Until last night, I thought that the problem was on my end. Now I am certain that it is an API issue. What has changed from Google's perspective? When can we see a resolution?