Summary:
commenting in YT using my g+ account; public settings:
the post/comment is only visible on YT when I am logged into my g+ account. Otherwise it doesnt show.
It could also be related to your sharing settings. For example, if someone posts a YT video on Google+, it will show up as a YT comment. And any replies made to the Google+ post will also show up as YT comments, but only according to the sharing settings.-Deozaan
the sharing setting are set when making the post - by default, 'Public' & 'Share on g+' are selected here - when posting in YT at any rate. My posts/comments have always been public. I dont see any way of changing that setting after the fact i.e. no way of now making them private (or have I missed something in settings?)
This is not related to not using my real name btw (my paranoia

).
Anyone else having this problem? (A google search doesnt show anything...)
[edit] is happening to others all right -
google YT forums - thread degenerates into censorship conspiracy theories, but I dont think I qualify as being worthy of censorship. At least I presume google knows about the problem, whether they do anything about it remains to be seen.
So,
my sole reason for using g+ is gone

[/edit]