Irrlicht Engine

when i use opengl render on fullscreen mode, it comes with a damn white border on bottom and left, this thing really sux. someone can help?

i havent had the whte border but I do know it sometimes wont alt-tab properly (leaves the back buffer showing)

I do not know a solution or so, just an idea: Do you clear the backbuffer with white color? If you use black, it does not look so ugly...
I have also a strange border at the bottom, but with black color the user does not notice it.

thanks for the help, i disabled the back buffer and it no more comes