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To answer your question, email here: service@limewire.com

This might not be your problem but go to LW's menu Tools>Options>Saving & change the Days to keep incomplete files to a large number like 999. Then press the Apply button.

Another possibility: The reason your downld preferences might have become corrupted is you haven't closed LW properly before shutting down your computer. Computer crashes can have this effect. Go to LW's Tools>Options>Shutdown & tick the option for Shutdown immediately & press apply button again. And make sure LW has properly closed down (might take half a minute) before shutting down your comp.