I have tried to post responses on some of the threads but they are not getting through. On some threads I can get through on the second attempt, elsewhere two attempts failed. It happens infrequently but often enough to be a pain. It happens even on threads where I have previously posted successfully.
One does not want to appear ignoring other people's posts especially if they contain helpful advice.
My "sent' folder shows the posts OK, they just do not show up on the forum.
Does this happen to others? Is this a function of the forum, the newsgroup provider, the news reader, all of the above, none of the above...?