I've noticed that, since the previous update, you can no longer filter saved searches and have it still show just the items added since the previous visit.
I used to search for a specific string of words that I had saved as a search and generally i'd get about 1,200 results. Sometimes I would filter this list so it only showed used items and it would come down to about 400 results.
Now when you try to filter the approximately 1,200 results to just show used items, it shows 21,000 items which is all of the used items, not just the items added previous tio the last visit.
