When I open a particular forum like this one, "Questions and Answers", the thread titles of threads that have been active since my last visit are in bold type. However, on one RCU forum that I visit, RC Skydiving, http://www.rcuniverse.com/forum/tt.asp?forumid=474 , the threads never have a bold title even when a post has been made. Any clues?

Ask this question in the "Forum Questions and Problems" Forum (it's the last one on the list of forums)