I had been using a plugin, “Podamibe Custom User Gravatar”, for quite sometime. After a very recent “update” of this plugin, I was locked out of my own account!
My host support investigated and found Podamibe was the cause and disabled it for me. I was then able to log in, at which point I UNINSTALLED this misbehaving piece of software. I found another, less intrusive substitute.
Just thought you would like to know….