I've got the latest Detonator-Driver for my nVidea Geforce 6600GT.
No overclocking and no other changes.
And there are strange Glitches e.g.:
There are some untextured polygons towards the Center of the screen
or sometimes parts of the previous screens were not refreshed and stay in front of the moving scene.
This looks really strange (next time I'll try to take a screenshot of this).
you enter that in your console "`" with out the quotes assuming you turned on the console,
And then?
Starting a Server, or joining a game?
Are there other Servers if LtK is enabled?