The Real Blogger Status Beta joined the ranks of the unhappy Bloggers, but just temporarily.
In my case, it was a feed problem. I removed 2 feeds, saved settings, and it's back online.
And I reported the problem to Blogger Support. Just got a reply, which looks to be from a person:
Thanks for letting us know about this bug with Blogger in beta. You were receiving this error due to Blogger not recognizing the URL you you entered into the Feed page element as a valid feed URL. We're looking into it and hope to have it fixed as soon as possible. In the meantime, to avoid this problem simply remove this page element from your blog and it should appear correctly. We appreciate your patience and apologize for any inconvenience.
The Blogger Team