Now sorted!!

Why oh why can't the Nvidia web site explain how to do this at all? Surely it's a common requirement.

the reason why this was failing is that my single monitor was plugged intothe analogue port on the graphics card. If I connect it to the digital port then the video overlay just woke up automagically and it all works wihtno effort from me at all.

Why is this so hard to document eh?

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I'm not young enough to know everything!