Change of format (implemented today?) means that it no longer seems possible to see all (new) topics for a (top-level) Discussion Board.
For example, the "Community Home > Printing and Digital Imaging: Enterprise" board ( http://h30499.www3.hp.com/t5/Printing-and-Digital-Imaging/ct-p/itrc-218 ) contains four subsidiary boards.
I used to be able to see all topics in the upper-level board, rather than having to visit each subsidiary board in turn.
The 'Latest Topics' tab shows a few of the latest topics in the (upper-level) board, and there is a 'See All' link - but this provides an index for topics in ALL discussion boards in the forums (i.e."Community Home > All Topics") which is rather unexpected (and totally useless in this context).