Yeah, I had that clicking too. It either went away or I don't notice it while playing. Pretty sure it's the former and not the latter. Annoying, but I can overlook it because I love this shoe.Got my first pair of GR8s, great looking (grey and orange version) and very comfortable and stable.
Two complaints though: I'm usually a 11.5, got these at 11 and even half a size down it's a bit long in the toebox, at least as long as my GR7s size 12. Anybody felt that? MY GR6s were fine in 11.
My vapors 9.5 size 11 were borderline uncomfortable but so speedy and glovelike.
And the upper does a clicking sound while walking, my GR7s did that too, hope it goes away.