File locked when Uploads window is opened.

- Saved a file (mp3) on my desktop;
- Dragged it onto my group's music folder;
- Opened the Uploads window by double clicking in the upload icon - status bar;
- After the file got send it disappeared from the Uploads window (as it should);
- I tried to delete the file from my desktop and I couldn't - tried many times;
- Closing the Uploads window solved it - I could delete the file;