I accidentally removed my "Downloads" stack earlier today. I thought getting it back should be easy -- just drag and drop the folder back in next to my trash icon. But now it only appears as a folder, not a stack (i.e., when I right click on it, I only have the "Options" and "Open" links, not all the stack options). Is there something obvious I'm doing wrong here? My user and applications folders that I added to my dock as stacks are still working properly. Thanks!