Unfortunately I cannot reply to bobn2's post directly now even though I could reply to another post in that thread but the answer to bobn2's query is that I cannot reply to posts in the thread I started at Site Feedback and Help.
This is the link to the thread I started but cannot reply to any posts in it.
dprevived.com/t/i-can-start-a-thread-but-cannot-reply-to-any-posts/59/
Another member posted they had intermittent issues with posting. They could reply to some posts but not others.