Have good friends/followers/readers who will let you know when they get the warning message from Blogger. Seriously. I was able to access my own blog, but this was a bad thing, because I received no notification from Blogger/Google indicating that there was a problem. Last time this happened, Jenny Lanctot of Are My Roots Showing? notified me (and sent me a copy of the message identifying the culprit) and this time Barbara Poole of Life from the Roots informed me and forwarded the message to me so that I could see what was causing the problem.
Thank you to these two good genea-blogger friends and to the friends who have let me know that everything is OK now.