Mouse black box

I have notice that when my mouse is over the window of Panda3D (I mean the window where the game is played) there is this black box where my mouse is.

(you can’t see my mouse because the program to make screens can’t do that)

This black box goes away and then comes back like every millisecond! Did some1 notice this 2? Or is it my pc?

I made this picture with a program because with Print Screen it isn’t showed.

(edit) I just found out that this box shows the last room(I dont know how to call it). So it don’t refresh the room where my mouse is in a box about 100*100.

This seems like a driver issue. I get similar behavior with the Linux NVidia driver for my old TNT2 card, but not on any other platform I run.