Hey champion, I think you're on to something:
If I go to the Landscape Talk forum, the first few threads are displayed in descending sequence by date and time of last post. From that point on down the list, they're kinda-sorta in descending sequence but there are a number of glitches where out of sequence threads show up. And as you suggested, if I display all the threads in any of the other forums, they're in perfect sequence.
Maybe send a PM to Tony..........
Bill