2012/4/5 Alejandro Carrazzoni <ale.carrazz...@gmail.com> > Package: xfce4 > Version: 4.8.0.3 > Severity: normal > > Sometimes a square appears on the top-left corner of the screen, usually > after > closing a maximized window. It only appears when looking at the desktop. > I'm > using xfce with nvidia propietrary drivers and compositing turned on. > There's a > screenshot attached that shows the problem. > > Dear Alejandro, I can see in your screenshot that you have Jdownloader running: I don't know why, but it is probably the cause of the problem. I experience something like that too.
I suggest you to try to test if the square ever shows up without Jdownloader running. Hope this helps, Best Regards Marco Milone