persistent Grey square on the top left hand corner of the screen while doing to drag and drop

[Kamil Paral]

> I use rawhide and whenever I drag and drop the files using nautilus or
> nemo  there is a persistent square on the top left hand corner of my
> screen both in gnome-shell and xfce. It disappears with closing of the
> file manager.
> can you guys help?
> here is the screenshot.
> https://dl.dropboxusercontent.com/u/106654446/Screenshot%20from%202013-05-06%2010%3A24%3A56.png

Run "xprop | grep CLASS" and click on that square. That should tell us which process is drawing it.