problem animating nodes with drivers... may be a bug?

hi
i’m having troubles trying to drive node values.

Here is a blend file with a simple setup to drive both a cube and a node with the same empty
http://www.pasteall.org/blend/4385

The cube is drived but in the node nothing changes…

Don’t know if it’s a bug or something i’m missing to get this working…(I’m in ubuntu 10.10 32 bits)

thanks

I think not every property can be driven at the moment, you may want to read this to get more info.