Strange space bar behaviour on T410s keyboard (makes space + cursor right)

I have just got in a T410s to my office which has a very quirky behaviour when hitting the space bar. It makes the space AND a cursor right. It happens in every application. The laptop is running Win 7 64-bit Enterprise.
But, here comes the quirky thing; It doesn't happen if I plug in an external keyboard. AND I have also tried replacing the keyboard unit itself with a brand new CRU, so it can't be a problem with the keyboard itself (except maybe the controller if it's down on the motherboard).
So, it feels likely it has to be a utility or a setting which the user has enabled by mistake, or possibly a driver error for the internal keyboard.
Any clues on what could be the cause?
-- Martin

The board needs to be replaced due to warranty, if there is no damage by liquids.
My home-forum: http://www.thinkpad-forum.de
Wiki: Deutsches ThinkPad-Wiki English ThinkWiki
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Strange space bar behaviour on T410s keyboard (makes space + cursor right)

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