I'm running 4.9.30.

It did it to me again last night. I had been on and off the computer all night checking the progress of the downloads, and they had been working fine(although a little slower than normal). I last checked in at around 10:30 pm and only one download had been completed. I then minimized it to the system tray and told it to close when all transfers were completed. When I woke up this morning, I moved the cursor towards the icon in the tray, and like many times before, the icon dissappeared. I proceeded to click the desktop icon to open Limewire, and when it had loaded it showed me that none of the downloads had made any progress since my last check last night.