Jerry,
You aggressively cleared your cache? In Chrome, it's "since the beginning of time", deleted all saved content, etc?
So you can't see any of your content or groups?
Is everyone in your organization having this problem or just you?
Do you recall when you were last able to access your content?
Have you made any changes that could have affected your access?
I suggest you call Esri Technical Support. The issue appears to be beyond what we can solve in the forums.
Thanks,
Mike