In the past, when I would search for a user's posts (see 1 below), it would show search results with all the contents previously posted. You then could either filter out just the "posts" or the "threads" the user created by clicking on one of the links for those two options at the bottom of the page. I don't see those links anymore. So how can I look up threads I or others have started?
Copy the link for the user's posts, and add &content=thread such as https://www.elitetrader.com/et/search/member?user_id=105578&content=thread This works for users that keep their profiles private (like you) and users who keep their profile public.