Scope 5.1-Cubase no midi+Vst digital tiks/crackz?-Help!

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hello

Got mij new comp! i7 installed scope 5.1 64bit.. no probleem. made scope look like befor, and that was steady!
i instaled Cubase 5 and some Vst plugs, have sound and i thingk al settings CB are oke for scope.
when i load a vst plug into CB the plug gives litte, but alot of digital tiks/cracks???
i know its a setting?
but cant find it, can someone tel me how to set Scope and Cubase?

Greetz Jerome