After following some of the tips from 
http://en.opensuse.org/Nvidia_Black_Window_Bug_Fix
and http://wiki.compiz.org/Troubleshooting , i don't seem to have the problem 
anymore., running lucid with KDE 4.4.2 and
nvidia 195.36.15 binary driver. Here are the relevant /etc/X11/xorg.conf 
entries :

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    Option         "RenderAccel" "true"
    Option         "UseEvents" "false"
    Option         "TripleBuffer" "1"
    Option         "DamageEvents" "1"
    Option         "BackingStore" "1"
    Option         "PixmapCacheSize" "70000"
    Option         "OnDemandVBlankInterrupts" "true"
EndSection

Section "Extensions"
  Option "DAMAGE" "Enable"
  Option "Composite" "Enable"
  Option "RENDER" "Enable"
EndSection

-- 
Compiz eventually begins showing completely black windows
https://bugs.launchpad.net/bugs/239235
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which is subscribed to linux-restricted-modules-2.6.24 in ubuntu.

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