Which command? 'updatedb' should exit silently unless something's wrong. And 'locate' should spit out something unless it's not on your system. Only thing I can think of is that the program installed to a restricted directory. I think 'slocate' actually doesn't show everything if you don't have the right permissions. Try it as root or I have to figure something went wrong with the install.
Or there's a typo in here somewhere.