Disappearing Dowmloads Queue - help?

As I understand it when you have to shut Limewire down for some reason -- like installing other software, etc -- it is supposed to remember the songs you lined up to download and resume attempting to download them when you relaunch Limewire. Although much of the time it does exactly that, twice in the last two days it has completely blanked out my download queue, losing many hours of searching and selecting.

Is this happening to others? And does anyone know how to fix it? Any help or ideas would be appreciated!

Mac G4 dual GHz, OS 10.1.5, Limewire 2.4.4