Can't get preview window to pop up.
 

I have an IMac system 9.0.4. I recently installed Limewire and have a library I'm building. The first day, I could doulbe click on the item and a preview window would appear were I could play the selected song. Now I can't get the window to pop up on any now selection. Please help. I did try to reinstall Limewire but that didn't help. Suggestions please!