Susan, the "Messages since last visit" uses the subject heading so YES.I'm not sure what to think on this one (and it is not my problem) other than to suggest that PERHAPS if a post is worthy of a change of subject heading, it is worthy of a new thread. Another point is that whereas replies to a newsgroup to the new subject would contain the new heading (and a clear new route of threads can be seen), Mudcat is linear and I think always uses the original Thread heading so there is nothing to be gained by a change for one post.
Jon