Small square appearing in top left corner because of jdownloader, in mint 16 xfce RC

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http://www.linuxquestions.org – There is a small weird square appearing in the top left corner of the screen when I start jdownloader. WHen I close Jdownloader the square disappears. It happens in linux mint 16 xfce RC. On a asus eeepc 1005pe netbook. The square stays on top off all apps, even fullscreen videos. See attached screenshot Attached Images Screenshot - 17-12-13 - 23:23:50.png (198.9 KB) (HowTos)