[kde-freebsd] Some windows in kde4 sometimes become black after resize/maximize

[Yuri]

I use current kde4 on 7.2-PRERELEASE with NVidia 9400GT card, nvidia 
driver and with compositing type=OpenGL.
Sometimes after window is maximized or resized it becomes black.

Changing compositing type to XRender and back fixes the problem for a while.
And then it happens again.

Yuri