up left and spacebar Key press bug?

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Hi!
I've only tested on max 5.1.7 windows vista yet, but if i press and hold simultaneously "up" , "left" and then hit "spacebar", the key object doesn't register the spacebar.
If instead I do "up" + "right" and spacebar, then the spacebar works...
Its probably OS or hardware related (acer keyboard), but just in case its not. Can anyone confirm?