I just found a strange bug in FDM 3.0.848.
Just now, i was downloading a file and I minimized FDM. Instead of going to the tray, it completely disappeared. The process FDM.EXE keeps running as a "phantom" process, but there's no way to acces the UI.
If i run fdm again, i get the UI, but if I minimize it, it disappears again...