Twice in the last few minutes while questing, I've been asked for items that show up on the quest page as "No such item: xxxx" Where xxxx is the item number. Once this was a Saggitarious quest and the item was Twilight Anyu Beanbag, the second time was Quentin and the item was Monster Slippers. When I hit the Shop search button, they show up the same way in shop search, as "No such item: xxxx". It does, however, show items for sale and the quest giver accepts them.
I've noticed something similar happening in the Fragmentizer shop. A bunch of things showing as "Item not found"
And an error in the forums: "Warning: implode(): Invalid arguments passed in /www/subeta.net/include/class/filter.php on line 686"
Not sure if these are related, but it seems like something broke.