It appears I'm not the only one with the issue
of not letting me comment on other blogs (or even my own!)
without being annon or typing in my name and url.
I think I got it figured out so thought I'd share.
Up here in the corner,
you should have your little picture in two spots.
The smaller one above it is where it shows that I'm signed into google.
I didn't have that smaller one when I couldn't comment.
Do you see the 3 little dots to the right of the smaller icon?
Click on those 3 dots and this drop down should appear.
When that drop-down appears, click on settings.That will take you to the magical screen that causes the issue.
My search engine, default browser and start up were all different.
I'm not sure I've cured it 100%, but at least I can be signed in now.
I had 3 different default browser addresses listed
and no search engine selected.
Then in start up,
I made sure it had the google address.
Now when I start my computer, it asks who is using it
and I can click on my image and name and it signs me in.
If I did anything else, it was on accident, and I don't know what it was.
Hope this helps~