I don't really know if this is a OS problem.
I realized this after upgrading the video Drivers, so it might be very well the drivers (52.16 Nvidia)
OK, my problem is the following:
If I go with the mouse to the right, I can go beyond the limit. WAY BEYOND!!!.
The screen itself doesn't continue, but the mouse according to what I calculated, can go about half screen size more over the limit. This is very annoying considering that when I go to the bars or close button if I go out of the screen I have to come back but I can see the pointer. Suggestions??