I've got the same problem.
After login everything is ok, but after opening/closing windows (let's say 
after one or two hour), I have to restart compiz because every new window is 
black.

So how to reproduce the symptom: fire up a lot of windows (for me ~700 xlogo)
for ((i=0;i<700;i++))
do
  xlogo &
done
killall xlogo

Here are some additional informations:

sudo lspci -v -s 01:00.0
01:00.0 VGA compatible controller: nVidia Corporation NV34 [GeForce FX 5200] 
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: LeadTek Research Inc. Unknown device 53c3
        Flags: bus master, 66MHz, medium devsel, latency 248, IRQ 17
        Memory at e1000000 (32-bit, non-prefetchable) [size=16M]
        Memory at f0000000 (32-bit, prefetchable) [size=128M]
        Capabilities: [60] Power Management version 2
        Capabilities: [44] AGP version 3.0

compiz version: 1:0.7.4-0ubuntu7

lsmod | grep nv
nvidia               7825536  34 
i2c_core               24832  1 nvidia
agpgart                34760  2 nvidia,intel_agp

cat /proc/version
Linux version 2.6.24-19-generic ([EMAIL PROTECTED]) (gcc version 4.2.3 (Ubuntu 
4.2.3-2ubuntu7)) #1 SMP Wed Jun 18 14:43:41 UTC 2008

Following the last comment in this thread seems to help:
"mjamesd February 18th, 2008, 11:00 AM
I'm on Ubuntu Gutsy 7.10 with nVidia 6800 GT (I think) and compiz-fusion. I 
edited the /usr/bin/compiz file, line with COMPIZ_OPTIONS to be this:
COMPIZ_OPTIONS="--ignore-desktop-hints --indirect-rendering --replace"
and I stopped getting black windows. Good luck, everyone."

** Attachment added: "X.org config file"
   http://launchpadlibrarian.net/15726540/xorg.conf

-- 
"black winodw"
https://bugs.launchpad.net/bugs/225625
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