I've got three downloads "stuck" in my queue. They say "Need more sources" but if I select them and hit "Find more sources", messages pop up "Error: You are already downloading foo", "Error: You are already downloading bar", "Error: You are already downloading baz" and none of them change to "Waiting 300s for sources" as normally occurs when "Find more sources" is hit. What is causing this and how do I fix it? I'm tempted to yell at my monitor when these messages pop up, something like "NO I AM NOT ALREADY DOWNLOADING IT, IT'S JUST SITTING HERE SAYING IT NEEDS MORE SOURCES, YOU IDIOT MACHINE!" :P