Another minor suggestion:
Perhaps change the default 'empty window text' to something other than "No Items Available". I know we can customise that text, but our customised option only appears to work as long as Auctiva is working. If there is a problem with the Store Window at Auctiva's end then our customers see "No Items Available" in great big letters which is pretty unpleasant for those of us who have a store full of other items we want to sell.
How about "Window content error - please check seller's other items" or something?
Just an idea.