F16 KDE desktop effects - incomplete

[mike cloaked]

I have two machines running f16 x86_64 fully up to date with a KDE desktop.....

One has the following graphics:
01:00.0 VGA compatible controller: nVidia Corporation G86M [Quadro FX
360M] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 01ff
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f2000000 (64-bit, non-prefetchable) [size=32M]
        I/O ports at df00 [size=128]
        [virtual] Expansion ROM at f4000000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidiafb

This machine runs KDE desktop effects beautifully - the cube for
virtual desktops switches wonderfully and wobbly windows works as I
would expect..

The other machine has the same system also x86_64 but its graphics is:
01:00.0 VGA compatible controller: nVidia Corporation G96 [Quadro FX
380] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: nVidia Corporation Device 063b
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at fc000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at fa000000 (64-bit, non-prefetchable) [size=32M]
        I/O ports at dc80 [size=128]
        Expansion ROM at fde00000 [disabled] [size=512K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau, nvidiafb

In this machine under the same conditions if I try to switch on
desktop effects in KDE then it gives a popup saying that a slew of
desktop effects cannot be turned on - including the cube.

Both machines are running the stock nouveau driver.....

Does anyone have a machine under the same conditions which does not
allow desktop effects to work properly in f16 and if so is there a fix
or workaround - or additional package needed - or a specific package
from updates-testing that might help?

Thanks

-- 
mike c