Quicksilver has a “recent items” cache / item proxy. The only problem is if you have deleted items that are showing up there. They never seem to go away!
To fix this you’ll have to manually go in and clear the Quicksilver Recent Items list.
To do this I exited Quicksilver, and renamed a file in this folder by adding “.old” to the end of it.
My file was a hidden file, called
.dat01c7.022, but your file will probably be named differently.
After restarting quicksilver the Recent Items had been cleared and things were wonderful again.