KDE Desktop effects

[Bogus Zaba]

I am not desperate to have all possible eye-candy operating, but I know 
that my system is capable of reasonable performance with regard to stuff 
like box-switching etc because it has worked before.

The system has an nvidia GeForce 7300 card and I am using the nvidia 
(proprietary) driver. The KDE is 4.5.5 under Slackware 13.37 which is 
the best I can run under Slack 13.37 without making some other 
significant system changes.

Recently KDE allows me to use only the XRender compositing type which 
provides a jerky experience if desktop effects are turned on. If I try 
and switch to OpenGL I get "Failed to activate desktop effects using the 
given config options" and it reverts to jerky Xrender. I have 
re-installed the nvidia driver and am sure it is working OK because the 
nvidia Server settings utility does what is expected (provides a cursor 
shadow for example). This utility also reports all sorts of OpenGL 
parameters and so it looks like OpenGL should work OK. Why is KDE not 
playing nicely?

Thanks
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