Hey folks--ok, so I finally caved and bought one of the new Apple keyboards (my G5 stock keyboard was, after 4 years, finally unusable). I've got it hooked up and all, and it's pretty neat, but I'm noticing a slight squeak in the spacebar. Is this normal? Or should I exchange the one I have? It doesn't bother me too much, and I'll likely get used to it, but if it isn't supposed to be squeaky, then I'd like to have one that doesn't...