I've noticed that sometimes drag and drop is not working as intended. I can usually find a file in FARR, drag it from the search results and drop it to some other app to do an action.
For example dragging an mp3 to foobar2000 will add it to the playlist, dragging any file to desktop will copy it there etc.
I've noticed that it doesn't always work, for example dragging and dropping to a new message window in Outlook doesn't do anything. I expect it to attach the file to the message.