Um, it's no big deal really. It's just, well, I like things tidy.
I noticed that on my 5 weblogs, three different kind of web address logos appear. So I deleted the image and reloaded the one that I want, (a teddybear, which actually already had showed up correct in two blogs). I did this procedure in My Public Profile 5 times, to make sure it 'got through' for all of them. But look; a week later, and there are still different favicons displayed:
Now the blog that I set as Main Blog, shows a standard 'W.' Meaning, 'no image available'. I just don't understand why it doesn't pick up my personal gravatar. Even if 'gravatar' is a big word for an image so micro tiny that one wants to start guessing how many teddybears can dance on a pin head.