I may have solved it. To reduce possible retaliation, I will refer to the famous blogging site I currently use as "GB". I'm being careful... ;)
I have had increasing difficulties using GB the past year or 2. Even trying to comment with my GB p@assword and accou@t name was less and less successful. I recently got a clue that GB doesn't like me using some other brows@rs. So I tried theirs. So far as I can tell, I'm suddenly getting through to all sites.
I have always tried to avoid using a single c@mpany's services for everything. They get control of too much informati@n.
Since my bl@gg comments suddenly get through using the Chr@mme browser, I feel forced to stay with it for a while. It is a matter of success vs priv@cy, and for bloggy comments, I will accept that.
So, if you are having troubles getting c@mments through to some "places you like", you might want to give chrr@me a try.
I'm not paranoid, but some business are retaliatory... LOL!