Thanks, J.S., for your timely and thoughtful reply. Tried with ZA disabled, and still no results for Vonda S, or Spitney Brears, but I was using wildcard (five asterisks) in the title. So I tried Salt 'n' Pepa, Push it, and got immediate "replies", same with Sade (forget which track title). Reloaded Zone Alarm, and tried again with the S & P and Sade tracks - same result - plenty of files.
So there we have it - nobody online with Vonda S or Britney Spears files, so nothing to download, hence the blank screen.
And btw, I allowed about three minutes for something to appear in each case. I guess we can't always assume that the music we want is "out there somewhere"! Picture caption should read "What Budgie?"