diff -Nur soundconverter-2.0.4-orig/soundconverter/ui.py soundconverter-2.0.4/soundconverter/ui.py
--- soundconverter-2.0.4-orig/soundconverter/ui.py	2012-10-06 12:43:23.000000000 +0200
+++ soundconverter-2.0.4/soundconverter/ui.py	2013-02-10 18:19:45.128353502 +0100
@@ -1430,6 +1430,7 @@
         self.filelist.hide_row_progress()
         self.status_frame.show()
         self.widget.set_sensitive(True)
+        self.converter.abort()
         try:
             from gi.repository import Unity
             launcher = Unity.LauncherEntry.get_for_desktop_id ("soundconverter.desktop")