Hi,

It is usually due to and active Num Lock.

I see in your post that you've disabled Scroll Lock with the Fn key, have you also disabled Num Lock ?

On my 2650 here, to disable Num Lock I have to press Fn+F11 (and Fn+F12 for Scroll Lock).

If it still won't work, maybe reinstalling keyboard will do the trick.

Regards,

Rick

Thank you very much