A long time ago, when I connected my youtube channel to google plus, my comments, unbeknownst to me, became invisible to everyone except me. Not even the owner of the channel could reply to my comments; in some cases they were unable to view the whole comment.
I made sure I had my setting configured to 'allow everyone to comment".
I searched and searched to find a solution. Finally I reached out to youtube. They told me they'd fixed the problem. But they had not b/c nothing changed. I decided I was being ghosted by google b/c so many other people had the same issue.
Then I stumbled on a tip that stated this:
"In order for your posts to be visible to everyone if your channel is
attached to a G+ profile: "Target audience"
(https://plus.google.com/u/0/settings/...) must be set to "Anyone".
Huh? I thought. Don't remember seeing that setting.
I clicked on the link provided, was taken to the Audience section of google+ and saw that I had it set to 'custom'.
I changed it to 'anyone'. And VOILA. Success!!
I found the tip in the 'show more' section below this video titled: video comments only visible to yourself (ghosted) test here.
The channel name is gbcalitest.