Downloaded several files, but not in my Library
 

I've noticed lately when I download songs, they all correctly list in the "Downloads" box at the bottom of the screen, but when I log back on a few hours later, none (or very few) are listed in my Library. How do I retain 100% of my audio downloads? (LW Version 5.3.6; Windows XP; cable modem).
Is my question too basic, or obvious to everyone else? Or impossible to answer? Currently, 24 times it's been read, but zero answers. Do I have to go with LimeWire Pro in order to get the information I need?