The fix required me to change some file permissions on my host server. When I did that, I did something wrong and broke my blog. Then things got pretty busy and I simply did not have the time or mental energy to figure out a computer problem.
Today, on a whim, I tried something else.
And it worked! At least I think it did.
My blog can be properly viewed once more. Sadly, I still can’t upload images the way I should be able to.
I will fix that issue next.