Error when downloading

For some reason, although I'm not downloading anything (I have only just logged on to my PC), it still says that I'm downloading something. I am using Opera 12 web browser and Windows 7, with 7-zip installed on it. Why does the system think I'm still downloading a file when I am only downloading one?
Post Merge: [time]1340533085[/time]
It started working now, for some reason. I think it only happens if you try and download a file too quickly after downloading a file.

Yeah sometimes there's a bit of lag, sadly fixing this situation is rather costly time wise so I can't guarantee it will get done any time soon.